ORCID Profile
0000-0002-6444-0756
Current Organisation
Memorial University of Newfoundland
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Research Topics
In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Top 5 Research Topics
ANZSRC Field of Research (FoR)
Maritime Engineering | Naval Architecture | Transport Engineering | Numerical and Computational Mathematics | Ship and Platform Hydrodynamics | Optimisation | Interdisciplinary Engineering Not Elsewhere Classified | Ship And Platform Hydrodynamics | Ocean Engineering |
ANZSRC Socio-Economic Objective (SEO)
Organised sports | Passenger Water Transport | Port Infrastructure and Management | Integrated systems | Wave Energy | Environmentally Sustainable Transport not elsewhere classified | International Sea Freight Transport (excl. Live Animal Transport)
Related Links
Publications
Proanthocyanidin Dimers and Trimers from Vitis vinifera Provide Diverse Structural Motifs for the Evaluation of Dentin Biomodification
Publisher: American Chemical Society (ACS)
Date: 21-08-2019
AUV Adaptive Sampling Methods: A Review
Publisher: MDPI AG
Date: 02-08-2019
DOI: 10.3390/APP9153145
Abstract: Autonomous underwater vehicles (AUVs) are unmanned marine robots that have been used for a broad range of oceanographic missions. They are programmed to perform at various levels of autonomy, including autonomous behaviours and intelligent behaviours. Adaptive s ling is one class of intelligent behaviour that allows the vehicle to autonomously make decisions during a mission in response to environment changes and vehicle state changes. Having a closed-loop control architecture, an AUV can perceive the environment, interpret the data and take follow-up measures. Thus, the mission plan can be modified, s ling criteria can be adjusted, and target features can be traced. This paper presents an overview of existing adaptive s ling techniques. Included are adaptive mission uses and underlying methods for perception, interpretation and reaction to underwater phenomena in AUV operations. The potential for future research in adaptive missions is discussed.
Sensitivity of AUV response to variations in hydrodynamic parameters
Publisher: Elsevier BV
Date: 04-2003
Harmonic Wave and Steady Current Effects on Plane Fishnets
Publisher: ASMEDC
Date: 2010
Abstract: In idual and interaction effects of parallel current and waves on three plane nets were empirically examined. A current opposing the direction of the waves was shown to shorten the wavelength while a current in-line with the direction of the waves stretched the wave length. Due to these wave modifications, the combined loads produced by a current and waves were significantly less than the sum of current and wave forces applied in idually. Applying a vector approach, the unsteady loads were split into drag forces and inertia components. Both components contributed considerably to the hydrodynamic loads for wave-only cases. For combinations of waves and current, the inertia force was significantly greater than the drag force. Further insights were also provided into the concepts of effective thickness and the modified Keulegan-Carpenter number as parameters quantifying inertia force and drag force for fishnets.
Conceptual Design of a Submersible Remotely Operated Swimming Dredger (SROSD)
Publisher: ASMEDC
Date: 2011
Abstract: Increasing use of deep-water dredging and mining vehicles has been anticipated for resource collection, engineering construction and environmental protection. Existing deep-dredging or mining equipment can be classified as i) er-assisted dredging tools, ii) surface-floating dredgers with deep-dredging capability and iii) submersible dredgers. Diver assisted dredging tools have limited capacity and involve human risk. Surface floating dredgers can work to a specific dredging depth controlled by their ladder length, but modification is limited by their large size and significant cost. Submersible dredgers are deployed for sub-sea operations and are the focus of this research. Submersible crawlers and walkers work in a submerged terrain-contact condition and depend on their apparent weight and ground reactions to counteract the excavation forces. Crawlers are inefficient in negotiating difficult sub-sea terrain and walking submersibles are slow moving over long-distances. Considering the constraints of dredging depth, negotiation of uneven terrain, slow motion, interchange ability of excavation or transport sub-system components and station keeping during operation, a new type of submersible dredger or miner was conceived. In working mode, it imitates a walking motion by spuds that are also used for station keeping during dredging. For longdistance travel, the vehicle can swim by means of vector thrusters. The vector thrusters also help in position-keeping and motion-control during swimming. To offset higher forces generated during excavation of hard materials, spuds, variable buoyancy tanks and control planes are included as secondary station-keeping devices. The paper describes the general arrangement and the distinguished sub-systems of the conceptualised vehicle. Special attention was given to working and swimming locomotion and the methods of station keeping during operation. Investigations about the station-keeping, propulsion and controlling conditions of the vehicle are in progress. Experiments to measure the cutting forces from the cutter design are described. It is expected that the new design will significantly contribute to the evolution of existing deep-dredging equipment with improved efficiency, increased mobility and location control while minimising larger environmental disturbances.
The Role of adaptive mission planning and control in persistent autonomous underwater vehicles presence
Publisher: IEEE
Date: 09-2012
Prototyping a series of bi-directional horizontal axis tidal turbines for optimum energy conversion
Publisher: Elsevier BV
Date: 11-2012
A Backseat Control Architecture for a Slocum Glider
Publisher: MDPI AG
Date: 15-05-2021
DOI: 10.3390/JMSE9050532
Abstract: Adaptive s ling provides an innovative and favorable method of improving the effectiveness of underwater vehicles in collecting data. Adaptive s ling works by controlling an underwater vehicle by using measurements from sensors and states of the vehicle. A backseat driver system was developed in this work and installed on a Slocum glider to equip it with an ability to perform adaptive s ling tasks underwater. This backseat driver communicated with the main vehicle control system of the glider through a robot operating system (ROS) interface. The external control algorithms were implemented through ROS nodes, which subscribed simulated sensor measurements and states of the glider and published desired states to the glider. The glider was set up in simulation mode to test the performance of the backseat driver as integrated into the control architecture of the glider. Results from the tests revealed that the backseat driver could effectively instruct the depth, heading, and waypoints as well as activate or deactivate behaviors adaptively. The developed backseat driver will be tested in future field experiments with sensors included and safety rules implemented before being applied in adaptive s ling missions such as adaptive oil spill s ling.
Insurance for autonomous underwater vehicles
Publisher: Society for Underwater Technology
Date: 06-2007
A three-dimensional wake impingement model and applications on tandem oscillating foils
Publisher: Elsevier BV
Date: 06-2007
Acute ecological risk associated with soot deposition: a Persian Gulf case study
Publisher: Elsevier BV
Date: 09-2001
Icing on a small horizontal-axis wind turbine — Part 2: Three dimensional ice and wet snow formations
Publisher: Elsevier BV
Date: 12-1992
Calibration of a wedge-shaped vee hot-film probe in a towing tank
Publisher: IOP Publishing
Date: 1993
Hydrodynamic Hull form Design Space Exploration of Large Medium-Speed Catamarans using Full-Scale CFD
Publisher: Royal Institution of Naval Architects
Date: 2015
DOI: 10.3940/RINA.IJME.2015.A3.331
Abstract: Large medium-speed catamarans are a new class of vessel currently under development as fuel-efficient ferries for sustainable fast sea transportation. Appropriate data to derive design guidelines for such vessels are not available and therefore a wide range of demihull slenderness ratios were studied to investigate the design space for fuel-efficient operation. Computational fluid dynamics for viscous free-surface flow simulations were utilised to investigate resistance properties of different catamaran configurations having a similar deadweight at light displacement, but with lengths ranging from 110 m to 190 m. The simulations were conducted at full-scale Reynolds numbers (log(Re) = 8.9 – 9.6) and Froude numbers ranged from Fr = 0.25 to 0.49. Hulls of 130 m and below had high transport efficiency below 26 knots and in light loading conditions while hulls of 150 m and 170 m showed benefits for heavier displacement cases and speeds up to 35 knots. Furthermore, the study concluded that the lowest drag was achieved with demihull slenderness ratios between 11 and 13.
Wave wake: Focus on vessel operations within sheltered waterways
Publisher: The Society of Naval Architects and Marine Engineers
Date: 08-2014
Ice Loads on a Model Podded Propeller Blade in Milling Conditions
Publisher: ASMEDC
Date: 2005
Abstract: Propeller-ice interaction experiments were conducted in the ice tank at the National Research Council of Canada’s Institute for Ocean Technology. A podded propeller was used in “Puller” mode and loads on an instrumented blade were measured. During the propeller-ice interaction, hydrodynamic loads and ice milling loads were acting on the propeller blade. This paper focuses on the ice milling loads both in water and in air. The ice milling loads, however, cannot be separated from the hydrodynamic loads perfectly. Even if the blade is milling the ice within an ice block, it is still experiencing hydrodynamic loads designated as inseparable hydrodynamic loads. The non-dimensional ice milling loads including inseparable hydrodynamic loads on the blade are presented against advance ratio with varied depths of cut. The results help to reduce the gap of knowledge for interaction between ice and propeller and give information about significant variables acting on the propeller blade during interaction.
Sizing a Hybrid Power System for Battle Harbour Island in Labrador
Publisher: SAGE Publications
Date: 05-2007
DOI: 10.1260/030952407783123097
Abstract: Battle Harbour is a small island in the Labrador Sea just off the South East coast of Labrador. Presently, electricity is generated on Battle Harbour using a diesel generator when the island is populated for 3 summer months per year. Due to its remote location, the fuel cost on Battle Harbour is very expensive. In this research we look into on-site renewable energy resources and conduct a feasibility study of a hybrid power system for Battle Harbour. We present one-year recorded power consumption data, wind, solar energy and hydro resources of the island and discuss options for reducing diesel consumption. Two cases are considered, a) load as usual b) load reduced by 50% after energy conservation measures. The sizing of the hybrid power system for both cases is discussed. This feasibility study indicates that by using a hybrid power system the diesel consumption on the island can be reduced to one sixth of its present annual consumption.
Wake Fields Behind Risers Undergoing Vortex-Induced Vibration
Publisher: ASMEDC
Date: 2008
Abstract: This paper presents measurements of the wake field behind three riser models obtained by using a Digital Particle Image Velocimetry (DPIV). The three riser models were a circular rigid cylinder, a cylinder fitted with fairings and a cylinder fitted with strakes. The models were free to vibrate in the cross-flow direction when towed in a uniform flow. The range of tested Reynolds number based on the diameter of the cylinder was from 3×104 to 2.5×105. The measurement results showed that the transverse vibration litudes for both the faired and straked cylinder were far less than those of the bare cylinder. Based on the wake flow field comparison between the models tested it was found that the modes of vortex shedding observed behind the bare cylinder did not occur behind either the faired or straked cylinder. This reveals that the vibrations responses of the cylinders are directly related to their wake modes. Strong, regularly shed vortices induce large litude vibration and weak, scattered vortices lead small litude or no vibration. The different wake patterns are presented for the three cylinders.
URANS study of scale effects on hydrodynamic manoeuvring coefficients of KVLCC2
Publisher: Elsevier BV
Date: 05-2016
Performance Evaluation of an Underwater Vehicle Equipped with a Collective and Cyclic Pitch Propeller
Publisher: Elsevier BV
Date: 2013
Hydrodynamic Performance and Cavitation of an Open Propeller in a Simulated Ice-Blocked Flow
Publisher: ASME International
Date: 08-1994
DOI: 10.1115/1.2920149
Abstract: Experiments were done on a 200-mm-dia open propeller behind a simulated ice blockage in a cavitation tunnel. The propeller performance in uniform flow and blocked flow is contrasted over a range of advance coefficients and at different cavitation numbers. Mean thrust and torque coefficients are presented. The types of cavitation, and its intermittent nature over a cycle of operation, are reported. The experiments indicate the likelihood of cavitation at full scale for blocked conditions and illustrate the effects of cavitation on mean values of thrust and torque.
Hydrodynamics of a conceptual FLNG system in side-by-side offloading operation
Publisher: Informa UK Limited
Date: 11-06-2018
Phase Averaged Flow Analysis in an Oscillating Water Column Wave Energy Converter
Publisher: ASME International
Date: 25-02-2013
DOI: 10.1115/1.4007076
Abstract: This paper presents the application of phase averaging to experimental data obtained during scale model testing of a forward facing bent duct oscillating water column (OWC). Phase averaging is applied to both wave probe data and a two-dimensional velocity field at the centerline plane of the OWC model obtained using particle imaging velocimetry (PIV). Results are presented for one monochromatic wave condition. The influence of varied wave frequency is briefly discussed.
Ice Loads Acting on a Model Podded Propeller Blade (OMAE2005-67416)
Publisher: ASME International
Date: 25-09-2006
DOI: 10.1115/1.2426993
Abstract: With the increase in popularity of podded propulsors and arctic navigation, understanding the interaction between a podded propulsor and ice has become more important. Propeller-ice interaction itself is a complicated process with a high level of uncertainty resulting from the uncertainties associated with the properties of the ice and with the propeller-ice interaction conditions. Model tests provide relatively well-controlled ice properties and interaction conditions to reduce the uncertainties. In order to improve the understanding of this interaction and to develop numerical models of it, a model podded propulsor was used in “Puller” mode, and ice loads were measured on its instrumented blade and propeller shaft. The results of the experiments conducted to simulate the interactions (milling) of the instrumented blade with ice in different operating conditions are reported in this paper. Loads measured during the milling consist of ice milling loads, “inseparable” hydrodynamic loads, and “separable” hydrodynamic loads. The s le results presented here include ice milling and inseparable hydrodynamic loads for various advance coefficients and depths of cut (amount of blade penetration into ice). Some results are compared with existing ice load models.
Conceptual Design of a Submersible Remotely Operated Swimming Dredger (SROSD)
Publisher: ASMEDC
Date: 2011
Abstract: Increasing use of deep-water dredging and mining vehicles has been anticipated for resource collection, engineering construction and environmental protection. Existing deep-dredging or mining equipment can be classified as i) er-assisted dredging tools, ii) surface-floating dredgers with deep-dredging capability and iii) submersible dredgers. Diver assisted dredging tools have limited capacity and involve human risk. Surface floating dredgers can work to a specific dredging depth controlled by their ladder length, but modification is limited by their large size and significant cost. Submersible dredgers are deployed for sub-sea operations and are the focus of this research. Submersible crawlers and walkers work in a submerged terrain-contact condition and depend on their apparent weight and ground reactions to counteract the excavation forces. Crawlers are inefficient in negotiating difficult sub-sea terrain and walking submersibles are slow moving over long-distances. Considering the constraints of dredging depth, negotiation of uneven terrain, slow motion, interchange ability of excavation or transport sub-system components and station keeping during operation, a new type of submersible dredger or miner was conceived. In working mode, it imitates a walking motion by spuds that are also used for station keeping during dredging. For longdistance travel, the vehicle can swim by means of vector thrusters. The vector thrusters also help in position-keeping and motion-control during swimming. To offset higher forces generated during excavation of hard materials, spuds, variable buoyancy tanks and control planes are included as secondary station-keeping devices. The paper describes the general arrangement and the distinguished sub-systems of the conceptualised vehicle. Special attention was given to working and swimming locomotion and the methods of station keeping during operation. Investigations about the station-keeping, propulsion and controlling conditions of the vehicle are in progress. Experiments to measure the cutting forces from the cutter design are described. It is expected that the new design will significantly contribute to the evolution of existing deep-dredging equipment with improved efficiency, increased mobility and location control while minimising larger environmental disturbances.
A comprehensive comparison of computational methods on propeller modelling of an AUV
Publisher: IEEE
Date: 11-2018
Noise characterisation of the Aurora Australis while stationary in Antarctic sea ice
Publisher: Elsevier BV
Date: 05-2014
URANS predictions of wave induced loads and motions on ships in regular head and oblique waves at zero forward speed
Publisher: Elsevier BV
Date: 10-2017
Numerical Prediction of Model Podded Propeller-Ice Interaction Loads
Publisher: ASMEDC
Date: 2006
Abstract: As the interest in arctic shipping and arctic exploration of oil and gas is increasing in recent years, the number of ice class vessels is increasing rapidly. Also the choices for propulsion devices are getting wider and these include podded propulsion systems. This study is a framework for the numerical prediction of the ice interaction loads acting on a podded propeller blade. The results of this study will help us to understand the propeller-ice interaction problem more comprehensively. Several studies for propeller-ice interaction have been carried out in the past few decades. Propeller-ice interaction, however, is a complicated process with a high level of uncertainties due to ice properties, ship operating conditions, and environmental conditions. Full-scale measurements involve high costs. In order to overcome these difficulties, model tests were carried out with model ice in an ice tank. The model tests provide well-controlled ice properties and interaction conditions to reduce the uncertainties. The tests were carried out in the ice tank with scaled down model ice at the National Research Council of Canada’s Institute for Ocean Technology. The ice loads acting on the propeller blade were measured with a six-component force and moment load cell fitted to the shaft and one of the propeller blades. Based on the experimental results, a numerical prediction model was developed to estimate the ice loads on the propeller blade. The numerical prediction is composed of three parts: the hydrodynamic calculations including separable and inseparable hydrodynamic loads, and the ice milling loads calculation. The separable and inseparable hydrodynamic loads can be obtained from clear water and blocked flow respectively. The hydrodynamic calculations were done by a low order panel method. The subroutines for calculating the ice milling loads are implemented into the panel method. The numerical prediction model for ice milling loads is described and the results are compared with those of experiments.
Risk-based decision-making for drilling waste discharges using a fuzzy synthetic evaluation technique
Publisher: Elsevier BV
Date: 11-2004
Environmental monitoring of fish plant effluent in coastal Newfoundland
Publisher: IEEE
Date: 2005
RANS prediction of FLNG-LNG hydrodynamic interactions in steady current
Publisher: Elsevier BV
Date: 10-2016
An Ecological Risk Assessment Methodology for Screening Discharge Alternatives of Produced Water
Publisher: Informa UK Limited
Date: 06-2004
Bubble Plume Tracking Using a Backseat Driver on an Autonomous Underwater Vehicle
Publisher: MDPI AG
Date: 16-10-2023
Adaptive Autonomous Underwater Vehicles: An Assessment of Their Effectiveness for Oceanographic Applications
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 02-2019
Marine Water Quality Assessment Of Synthetic-Based Drilling Waste Discharges
Publisher: Informa UK Limited
Date: 08-2003
Vortex modes and vortex-induced vibration of a long, flexible riser
Publisher: Elsevier BV
Date: 05-2009
Propulsion of a fin whale( Balenoptera physalus): why the fin whale is a fast swimmer
Publisher: The Royal Society
Date: 22-07-1989
Abstract: Measurements of an immature fin whale {Balaenoptera physalus), which died as a result of entrapment in fishing gear near Frenchmans Cove, Newfoundland (47° 9' N, 55° 25' W), were made to obtain estimates of volume and surface area of the animal. Detailed measurements of the flukes, both planform and sections, were also obtained. A strip theory was developed to calculate the hydrodynamic performance of the whale’s flukes as an oscillating propeller. This method is based on linear, two-dimensional, small- litude, unsteady hydrofoil theory with correction factors used to acount for the effects of finite span and finite litude motion. These correction factors were developed from theoretical results of large- litude heaving motion and unsteady lifting-surface theory. A model that makes an estimate of the effects of viscous flow on propeller performance was superimposed on the potentialflow results. This model estimates the drag of the hydrofoil sections by assuming that the drag is similar to that of a hydrofoil section in steady flow. The performance characteristics of the flukes of the fin whale were estimated by using this method. The effects of the different correction factors, and of the frictional drag of the fluke sections, are emphasized. Frictional effects in particular were found to reduce the hydrodynamic efficiency of the flukes significantly. The results are discussed and compared with the known characteristics of fin-whale swimming.
Toxaphene distribution in the Lake Superior trout and associated sublethal ecological risk: a probabilistic approach
Publisher: Elsevier BV
Date: 06-2003
The ‘W’ Prawn-Trawl with Emphasised Drag-Force Transfer to Its Centre Line to Reduce Overall System Drag
Publisher: Public Library of Science (PLoS)
Date: 09-03-2015
URANS predictions on the hydrodynamic interaction of a conceptual FLNG-LNG offloading system in regular waves
Publisher: Elsevier BV
Date: 04-2018
Vortex modes and vortex-induced vibration of a long, flexible riser
Publisher: Elsevier BV
Date: 05-2009
Energy balance analysis for an oscillating water column wave energy converter
Publisher: Elsevier BV
Date: 11-2012
Oil Plume Mapping: Adaptive Tracking and Adaptive Sampling From an Autonomous Underwater Vehicle
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 2020
The memorial explorer: Developing the role of AUVs in under-ice research
Publisher: IEEE
Date: 05-2010
Fuzzy System Dynamics Risk Analysis (FuSDRA) of Autonomous Underwater Vehicle Operations in the Antarctic.
Publisher: Wiley
Date: 04-12-2020
DOI: 10.1111/RISA.13429
Abstract: With the maturing of autonomous technology and better accessibility, there has been a growing interest in the use of autonomous underwater vehicles (AUVs). The deployment of AUVs for under-ice marine science research in the Antarctic is one such ex le. However, a higher risk of AUV loss is present during such endeavors due to the extreme operating environment. To control the risk of loss, existing risk analyses approaches tend to focus more on the AUV's technical aspects and neglect the role of soft factors, such as organizational and human influences. In addition, the dynamic and complex interrelationships of risk variables are also often overlooked due to uncertainties and challenges in quantification. To overcome these shortfalls, a hybrid fuzzy system dynamics risk analysis (FuSDRA) is proposed. In the FuSDRA framework, system dynamics models the interrelationships between risk variables from different dimensions and considers the time-dependent nature of risk while fuzzy logic accounts for uncertainties. To demonstrate its application, an ex le based on an actual Antarctic AUV program is presented. Focusing on funding and experience of the AUV team, simulation of the FuSDRA risk model shows a declining risk of loss from 0.293 in the early years of the Antarctic AUV program, reaching a minimum of 0.206 before increasing again in later years. Risk control policy recommendations were then derived from the analysis. The ex le demonstrated how FuSDRA can be applied to inform funding and risk management strategies, or broader application both within the AUV domain and on other complex technological systems.
Risk-based path planning for autonomous underwater vehicles in an oil spill environment
Publisher: Elsevier BV
Date: 12-2022
Evaluation of a Dynamic Positioning Thruster Wake Using Laser Doppler Velocimetry
Publisher: ASMEDC
Date: 2004
Abstract: To provide information on the wake characteristics of Dynamic Positioning (DP) thrusters when operating with and without a nozzle under varied operating conditions, experiments were done on a ducted propeller model in a cavitation tunnel. The propeller flow field was measured with a two-component Laser Doppler Velocimetry (LDV) system, up to 1.5 diameters downstream. These experiments were carried out with and without the nozzle, and the results are presented here for a pitch/diameter ratio of 1.2 and an advance coefficient of 0.4. This paper shows and compares the results of the DP thruster near wake hydrodynamic characteristics obtained by the LDV system when operating with and without a nozzle.
Detailed Analysis of the Wake of a DP Thruster Emphasizing Comparison Between LDV and SPIV Techniques
Publisher: ASME International
Date: 04-11-2005
DOI: 10.1115/1.2185680
Abstract: To provide experimental data on the hydrodynamic characteristics and features of dynamic positioning (DP) thrusters under variable operating conditions, wake measurements were performed on a DP thruster model using 2D laser Doppler velocimetry (LDV) and stereoscopic particle image velocimetry (SPIV). These tests were performed with and without a nozzle and over a range of advance coefficient values including the bollard pull condition. In this paper, a detailed analysis of the hydrodynamic characteristics of the wake at a plane equal to a distance of 0.5 diameters downstream from the thruster, at advance coefficient values of 0, 0.4, and 0.45 are presented for both the LDV and SPIV measurements showing a comparison between the results of each technique. The effect of the duct and of changes in the advance coefficient values is presented in this paper.
URANS Prediction of Ship Hydrodynamics in Head Sea Waves at Zero Forward Speed With Model Testing Validation
Publisher: American Society of Mechanical Engineers
Date: 19-06-2016
Abstract: The paper presents computations on predicting the hydrodynamics of a generic floating liquefied natural gas (FLNG) hull form in regular head sea waves using unsteady Reynolds-Averaged Navier-Stokes (URANS) solver StarCCM+. Initially, model scale simulations were conducted at model test basin water depth (d = 0.8m), with detailed verification and validation study performed to estimate numerical uncertainties. The simulation results were compared with potential flow solutions and validated against experimental studies. Using the verified numerical setup, ship hydrodynamics including wave induced loads, moments as well as ship motion responses in deep water waves (d = 8.0m) have been studied. The computed time history results were decomposed by Fourier series to obtain force/moment and motion transfer functions on the frequency domain. From the obtained results, the presented URANS approach demonstrates slightly better accuracy compared with potential flow (PF) solutions. It is also found that water depth has great influences on the computed wave force and ship motion transfer functions for certain range of wave frequencies.
An operational risk awareness tool for small fishing vessels operating in harsh environment
Publisher: Elsevier BV
Date: 06-2023
SWIMMING KINEMATICS OF A HARBOR PORPOISE (PHOCOENA PHOCOENA) AND AN ATLANTIC WHITE‐SIDED DOLPHIN (LAGENORHYNCHUS ACUTUS)
Publisher: Wiley
Date: 10-1994
An acoustic signal propagation experiment beneath sea ice
Publisher: Elsevier BV
Date: 04-2012
High Porosity Net Drag at a Low Angle of Attack in Application to a Representative Prawn Trawl
Publisher: American Society of Mechanical Engineers
Date: 07-2012
Abstract: The presented work investigated the extent by which Reynolds number determines the drag coefficient for high porosity nets at a low angle of attack. A simple prawn trawl model that incorporates the main design features of prawn trawls employed in Australia was developed. Four trawl models of various high porosities were tested in a flume tank with respect to drag and shape over a range of flow velocities. The physical trawl model was analysed as a system of independent plane net sheets, each with an orientation to the flow estimated from analysis of stereo-vision data. The main finding was that the drag coefficient was weakly dependent on the Reynolds number in the range typical for prawn trawl operations, 1000 Re . These combined findings imply that trawler operators can approximately estimate prawn net drag from a function containing trawl twine area, towing speed and spread ratio.
Model testing of a series of bi-directional tidal turbine rotors
Publisher: Elsevier BV
Date: 04-2014
Phase averaging of the velocity fields in an oscillating water column using splines
Publisher: SAGE Publications
Date: 23-03-2012
Abstract: The principal objective of this paper is to present a phase averaging method by curve fitting using B-splines. The method was designed specifically to process phase-clumped and discontinuous periodic data. Phase averaging by ensemble averaging of data clumped in phase will cause phase bias error if the mean phase of the clumped data does not equal the desired phase. The curve-fitting method presented here avoids phase bias error. The performance of the curve-fitting method was compared favourably with the ensemble averaging method when processing phase-clumped experimental data. Generally, the curve-fitting method exceeded the performance of the ensemble averaging method when the data were clumped in phase and matched the performance of the ensemble averaging method when the data were randomly distributed in phase. Experimentally obtained phase-clumped two-dimensional velocity fields at the centre-line of a forward-facing bent-duct oscillating water column were processed using the curve-fitting method. The phase-averaged velocity fields were combined for visualization purposes in the form of animated graphics interchange format (GIF) images to show the velocity fields over a wave cycle. The GIF images correspond to the four separate monochromatic wave frequencies tested and accompany the online version of this paper. The GIF images reveal the two-dimensional phase-averaged flow characteristics at the centre-line of the model with phenomena including oscillating flow, water column heave and slosh, front-wall swash and down wash, an outflow jet and vortices. It was concluded that phase averaging using splines finds a niche for the phase averaging of data which are dispersed (or clumped) in phase.
Aquaculture Net Drag Force and Added Mass
Publisher: Elsevier BV
Date: 07-2009
Novel CFD-based full-scale resistance prediction for large medium-speed catamarans
Publisher: Elsevier BV
Date: 2016
Discussions on locomotion and excavation systems of ‘SROSD II’
Publisher: IEEE
Date: 02-2015
Phase Averaged Flow Analysis in an Oscillating Water Column Wave Energy Converter
Publisher: ASMEDC
Date: 2011
Abstract: This paper presents the application of phase averaging to experimental data obtained during scale model testing of a forward facing bent duct oscillating water column (OWC). Phase averaging is applied to both wave probe data and a two dimensional velocity field at the centreline plane of the OWC model obtained using PIV. Results are presented for one monochromatic wave condition. The influence of varied wave frequency is briefly discussed.
Wake Fields Behind Risers Undergoing Vortex-Induced Vibration
Publisher: ASMEDC
Date: 2008
Abstract: This paper presents measurements of the wake field behind three riser models obtained by using a Digital Particle Image Velocimetry (DPIV). The three riser models were a circular rigid cylinder, a cylinder fitted with fairings and a cylinder fitted with strakes. The models were free to vibrate in the cross-flow direction when towed in a uniform flow. The range of tested Reynolds number based on the diameter of the cylinder was from 3×104 to 2.5×105. The measurement results showed that the transverse vibration litudes for both the faired and straked cylinder were far less than those of the bare cylinder. Based on the wake flow field comparison between the models tested it was found that the modes of vortex shedding observed behind the bare cylinder did not occur behind either the faired or straked cylinder. This reveals that the vibrations responses of the cylinders are directly related to their wake modes. Strong, regularly shed vortices induce large litude vibration and weak, scattered vortices lead small litude or no vibration. The different wake patterns are presented for the three cylinders.
Experimental Analysis of the Near Wake from a Ducted Thruster at True and Near Bollard Pull Conditions Using Stereo Particle Image Velocimetry (SPIV)
Publisher: ASME International
Date: 03-03-2005
DOI: 10.1115/1.1951770
Abstract: Thrusters working at low advance coefficients are employed in a wide range of offshore and marine applications on Floating, Production, Storage, and Offloading (FPSO) systems shuttle tankers tug boats and mobile offshore units. Therefore, an understanding of the flow around the thrusters is of great practical interest. Despite this interest, there is lack of knowledge in the description of the hydrodynamic characteristics of a ducted thruster’s wake at bollard pull and low advance coefficient values. This work was aimed at providing detailed data about the hydrodynamic characteristics of a Dynamic Positioning (DP) thruster near wake flow at different low advance coefficient values. Wake measurements were made during cavitation tunnel tests carried out on a ducted propeller model at the Italian Ship Model Basin (INSEAN), Rome, Italy. Through these experiments, the DP thruster near wake velocity components at different downstream axial planes, up to 1.5 diameters downstream, were obtained using a Stereoscopic Particle Image Velocimetry (SPIV) system. These experiments were carried out at different advance coefficient (J) values [bollard pull (J=0), J=0.4 and J=0.45].
A novel methodology to develop risk-based maintenance strategies for fishing vessels
Publisher: Elsevier BV
Date: 06-2022
Loss of stability risk analysis in small fishing vessels
Publisher: Elsevier BV
Date: 11-2023
Estimating Water Current Velocities by Using a Model-Based High-Gain Observer for an Autonomous Underwater Vehicle
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 2018
Sensitivity of AUV added mass coefficients to variations in hull and control plane geometry
Publisher: Elsevier BV
Date: 04-2003
Decision support system for risk management of produced water in offshore oil and gas industries
Publisher: Inderscience Publishers
Date: 2009
Microbubbles as Proxies for Oil Spill Delineation in Field Tests
Publisher: MDPI AG
Date: 27-01-2021
DOI: 10.3390/JMSE9020126
Abstract: To overcome the environmental impacts of releasing oil into the ocean for testing acoustic methods in field experiments using autonomous underwater vehicles (AUVs), environmentally friendly gas bubble plumes with low rise velocities are proposed in this research to be used as proxies for oil. An experiment was conducted to test the performance of a centrifugal-type microbubble generator in generating microbubble plumes and their practicability to be used in field experiments. Sizes of bubbles were measured with a Laser In-Situ Scattering and Transmissometry sensor. Residence time of bubble plumes was estimated by using a Ping360 sonar. Results from the experiment showed that a larger number of small bubbles were found in deeper water as larger bubbles rose quickly to the surface without staying in the water column. The residence time of the generated bubble plumes at the depth of 0.5 m was estimated to be over 5 min. The microbubble generator is planned to be applied in future field experiments, as it is effective in producing relatively long-endurance plumes that can be used as potential proxies for oil plumes in field trials of AUVs for delineating oil spills.
Evaluation of Generic Types of Drilling Fluid Using a Risk-Based Analytic Hierarchy Process
Publisher: Springer Science and Business Media LLC
Date: 12-2003
DOI: 10.1007/S00267-003-0009-2
Abstract: The composition of drilling muds is based on a mixture of clays and additives in a base fluid. There are three generic categories of base fluid--water, oil, and synthetic. Water-based fluids (WBFs) are relatively environmentally benign, but drilling performance is better with oil-based fluids (OBFs). The oil and gas industry developed synthetic-based fluids (SBFs), such as vegetable esters, olefins, ethers, and others, which provide drilling performance comparable to OBFs, but with lower environmental and occupational health effects. The primary objective of this paper is to present a methodology to guide decision-making in the selection and evaluation of three generic types of drilling fluids using a risk-based analytic hierarchy process (AHP). In this paper a comparison of drilling fluids is made considering various activities involved in the life cycle of drilling fluids. This paper evaluates OBFs, WBFs, and SBFs based on four major impacts--operations, resources, economics, and liabilities. Four major activities--drilling, discharging offshore, loading and transporting, and disposing onshore--cause the operational impacts. Each activity involves risks related to occupational injuries (safety), general public health, environmental impact, and energy use. A multicriteria analysis strategy was used for the selection and evaluation of drilling fluids using a risk-based AHP. A four-level hierarchical structure is developed to determine the final relative scores, and the SBFs are found to be the best option.
Model testing and performance comparison of plastic and metal tidal turbine rotors
Publisher: Elsevier BV
Date: 10-2015
Experimental study on a model azimuthing podded propulsor in ice
Publisher: Springer Science and Business Media LLC
Date: 08-2008
Numerical Investigation of the Influence of Span-wise Force Variation in Circular Cylinders Undergoing Vortex Induced Vibrations at High Reynolds Number
Publisher: IEEE
Date: 09-2007
An Advanced Measurement System for Vortex-Induced-Vibrations Characterization in Large-Scale Risers
Publisher: IEEE
Date: 09-2007
Phase Averaged Flow Analysis in an Oscillating Water Column Wave Energy Converter
Publisher: ASMEDC
Date: 2011
Abstract: This paper presents the application of phase averaging to experimental data obtained during scale model testing of a forward facing bent duct oscillating water column (OWC). Phase averaging is applied to both wave probe data and a two dimensional velocity field at the centreline plane of the OWC model obtained using PIV. Results are presented for one monochromatic wave condition. The influence of varied wave frequency is briefly discussed.
Acoustic Search and Detection of Oil Plumes Using an Autonomous Underwater Vehicle
Publisher: MDPI AG
Date: 17-08-2020
DOI: 10.3390/JMSE8080618
Abstract: We introduce an adaptive s ling method that has been developed to support the Backseat Driver control architecture of the Memorial University of Newfoundland (MUN) Explorer autonomous underwater vehicle (AUV). The design is based on an acoustic detection and in-situ analysis program that allows an AUV to perform automatic detection and autonomous tracking of an oil plume. The method contains acoustic image acquisition, autonomous triggering, and thresholding in the search stage. A new biomimetic search pattern, the bumblebee flight path, was designed to maximize the spatial coverage in the oil plume detection phase. The effectiveness of the developed algorithm was validated through simulations using a two-dimensional planar plume model and a 90-degree scanning sensor model. The results demonstrate that the bumblebee search design combined with a genetic solution for the Traveling Salesperson Problem outperformed a conventional lawnmower survey, reducing the AUV travel distance by up to 75.3%. Our plume detection strategy, using acoustic sensing, provided data of plume location, distribution, and density, over a sector in contrast with traditional chemical oil sensors that only provide readings at a point.
High Mode Vortex Induced Vibration (VIV) Experiments on a Large-Scale Riser
Publisher: IEEE
Date: 09-2007
Ocean Outfall Mapping Using an Autonomous Underwater Vehicle
Publisher: IEEE
Date: 09-2007
Energy absorption from ocean waves: a free ride for cetaceans
Publisher: The Royal Society
Date: 22-06-1990
Abstract: Flukes of cetaceans are capable of absorbing energy from ocean waves for propulsion. The extent of this energy absorption is demonstrated by considering the flukes of an immature fin whale, Balaenoptera physalus . In a fully developed seaway corresponding to a wind speed of 20 knots (around Beaufort force 5) and at a low swimming speed, of 2.5 m s -1 , this whale was able to absorb up to 25% of its required propulsive power in head seas and 33% of propulsive power in following seas. Consequences of wave-energy absorption for energetics of cetacean migrations are discussed.
Autonomous Underwater Vehicle Model-Based High-Gain Observer for Ocean Current Estimation
Publisher: IEEE
Date: 11-2018
Modelling acoustic propagation beneath Antarctic sea ice using measured environmental parameters
Publisher: Elsevier BV
Date: 09-2016
Hydrodynamic characteristics of a lunate shape oscillating propulsor
Publisher: Elsevier BV
Date: 06-1999
C-SCOUT: a general-purpose AUV for systems research
Publisher: IEEE
Date: 2000
Manoeuvring Experiments Using the MUN Explorer AUV
Publisher: IEEE
Date: 04-2007
Wave-piercing catamaran transom stern ventilation process
Publisher: Informa UK Limited
Date: 21-04-2016
Experimental Evaluation of a Dynamic Positioning Thruster Prohibited Operating Zone Using Stereoscopic Particle Image Velocimetry (SPIV)
Publisher: ASMEDC
Date: 2006
Abstract: The knowledge of the effects of the wakes from Dynamic Positioning (DP) thrusters and the practical need to describe and predict their impact is fundamental in the assessment of design loading on slipstream-submerged structures (moorings, risers, and equipment) associated with offshore floating systems. In particular, with the increasing importance and application of DP thrusters in the offshore industry, the designer as well as the operator must have more information about thruster-structures interaction effects and the safest location of DP thrusters regarding to any submerged structures. This paper contributes at this knowledge by experimentally evaluating of a DP thruster model far wake induced load. This is by evaluating the DP thruster wake thrust and force loading distribution and propagation, when operating with and without a nozzle, at high loading conditions (J = 0 and J = 0.4) and up to 15 diameters downstream of the model. Experiments were performed using a Stereoscopic Particle Image Velocimetry (SPIV) at the Italian Ship Model Basin (INSEAN) large cavitation tunnel. This paper evaluates the safest location of DP thruster when operating with and without a nozzle.
The effect of mesh orientation on netting drag and its application to innovative prawn trawl design
Publisher: Elsevier BV
Date: 04-2015
Transport properties of offshore discharged synthetic based drilling cuttings
Publisher: IEEE
Date: 2003
A Fuzzy-Based Risk Assessment Framework for Autonomous Underwater Vehicle Under-Ice Missions.
Publisher: Wiley
Date: 18-07-2019
DOI: 10.1111/RISA.13376
Abstract: The use of autonomous underwater vehicles (AUVs) for various scientific, commercial, and military applications has become more common with maturing technology and improved accessibility. One relatively new development lies in the use of AUVs for under-ice marine science research in the Antarctic. The extreme environment, ice cover, and inaccessibility as compared to open-water missions can result in a higher risk of loss. Therefore, having an effective assessment of risks before undertaking any Antarctic under-ice missions is crucial to ensure an AUV's survival. Existing risk assessment approaches predominantly focused on the use of historical fault log data of an AUV and elicitation of experts' opinions for probabilistic quantification. However, an AUV program in its early phases lacks historical data and any assessment of risk may be vague and ambiguous. In this article, a fuzzy-based risk assessment framework is proposed for quantifying the risk of AUV loss under ice. The framework uses the knowledge, prior experience of available subject matter experts, and the widely used semiquantitative risk assessment matrix, albeit in a new form. A well-developed ex le based on an upcoming mission by an ISE-explorer class AUV is presented to demonstrate the application and effectiveness of the proposed framework. The ex le demonstrates that the proposed fuzzy-based risk assessment framework is pragmatically useful for future under-ice AUV deployments. Sensitivity analysis demonstrates the validity of the proposed method.
Fuzzy rule-based modelling for human health risk from naturally occurring radioactive materials in produced water
Publisher: Elsevier BV
Date: 2006
DOI: 10.1016/J.JENVRAD.2006.03.002
Abstract: Produced water, discharged from offshore oil and gas operations, contains chemicals from formation water, condensed water, and any chemical added down hole or during the oil/water separation process. Although, most of the contaminants fall below the detection limits within a short distance from the discharge port, a few of the remaining contaminants including naturally occurring radioactive materials (NORM) are of concern due to their bioavailability in the media and bioaccumulation characteristics in finfish and shellfish species used for human consumption. In the past, several initiatives have been taken to model human health risk from NORM in produced water. The parameters of the available risk assessment models are imprecise and sparse in nature. In this study, a fuzzy possibilistic evaluation using fuzzy rule based modeling has been presented. Being conservative in nature, the possibilistic approach considers possible input parameter values thus provides better environmental prediction than the Monte Carlo (MC) calculation. The uncertainties of the input parameters were captured with fuzzy triangular membership functions (TFNs). Fuzzy if-then rules were applied for input concentrations of two isotopes of radium, namely (226)Ra, and (228)Ra, available in produced water and bulk dilution to evaluate the radium concentration in fish tissue used for human consumption. The bulk dilution was predicted using four input parameters: produced water discharge rate, ambient seawater velocity, depth of discharge port and density gradient. The evaluated cancer risk shows compliance with the regulatory guidelines thus minimum risk to human health is expected from NORM components in produced water.
Propulsive performance from oscillating propulsors with spanwise flexibility
Publisher: The Royal Society
Date: 08-08-1997
Evidence to the role of interflavan linkages and galloylation of proanthocyanidins at sustaining long-term dentin biomodification
Publisher: Elsevier BV
Date: 02-2019
Rapid assessment of boat-generated waves within sheltered waterways
Publisher: Informa UK Limited
Date: 2014
Evaluation, design and optimization for strength and integrity of polar class propellers
Publisher: Elsevier BV
Date: 05-2015
Full-scale resistance prediction in finite waters: A study using computational fluid dynamics simulations, model test experiments and sea trial measurements
Publisher: SAGE Publications
Date: 03-08-2016
Abstract: The development of large medium-speed catamarans aims increasing economic viability and reducing the possible negative influence on the environment of fast sea transportation. These vessels are likely to operate at hump speed where wave-making can be the dominating component of the total resistance. Shallow water may considerably lify the wave-making and hence the overall drag force. Computational fluid dynamics is used to predict the drag force of medium-speed catamarans at model and full scale in infinite and restricted water to study the impact on the resistance. Steady and unsteady shallow-water effects that occur in model testing or full-scale operation are taken into account using computational fluid dynamics as they are inherently included in the mathematical formulations. Unsteady effects in the ship-model response were recorded in model test experiments, computational fluid dynamics simulations and full-scale measurements and found to agree with each other. For a medium-speed catamaran in water that is restricted in width and depth, it was found that computational fluid dynamics is capable of accurately predicting the drag with a maximum deviation of no more than 6% when compared to experimental results in model scale. The influences of restricted depth and width were studied using computational fluid dynamics where steady finite width effects in shallow water and finite depth effects at finite width were quantified. Full-scale drag from computational fluid dynamics predictions in shallow water ( h/L = 0.12 – 0.17) was found to be between full-scale measurements and extrapolated model test results. Finally, it is shown that current extrapolation procedures for shallow-water model tests over-estimate residuary resistance by up to 12% and underestimate frictional forces by up to 35% when compared to validated computational fluid dynamics results. This study concludes that computational fluid dynamics is a versatile tool to predict the full-scale ship resistance to a more accurate extent than extrapolation model test data and can also be utilised to estimate model sizes that keep finite-water effects to an agreed minimum.
A Practical Design Approach including Resistance Predictions for Medium-speed Catamarans
Publisher: Informa UK Limited
Date: 2013
Human Error in Autonomous Underwater Vehicle Deployment: A System Dynamics Approach
Publisher: Wiley
Date: 06-03-2020
DOI: 10.1111/RISA.13467
Development and optimization of dual-mode propellers for renewable energy
Publisher: Elsevier BV
Date: 04-2018
Propulsive performance of three naturally occurring oscillating propeller planforms
Publisher: Elsevier BV
Date: 1993
Hydrodynamic loads on ice-class propellers during propeller-ice interaction
Publisher: Springer Science and Business Media LLC
Date: 03-1997
DOI: 10.1007/BF01245933
Acute ecological risk associated with soot deposition: a Persian Gulf case study
Publisher: Elsevier BV
Date: 09-2001
Morphological variation in the harbour porpoise (Phocoena phocoena)
Publisher: Canadian Science Publishing
Date: 05-1993
DOI: 10.1139/Z93-143
Abstract: Average values of morphological parameters for mature harbour porpoise (Phocoena phocoena) are presented. Variation in these parameters with body length was examined for a s le of 35 porpoise. Several parameters including fineness ratio, fluke aspect ratio, and the ratios of fluke area:body surface area and (body surface area) 1/2 :(body volume) 1/3 were found to vary with body length. Fluke aspect ratio was inversely proportional to fluke sweep angle. The finding that many morphological parameters vary with length for harbour porpoise indicates the dependence of these parameters on age this may also be true for other cetacean species.
An extended power law model for the calibration of hot-wire/hot-film constant temperature probes
Publisher: Elsevier BV
Date: 02-1994
Analyzing operational risk for small fishing vessels considering crew effectiveness
Publisher: Elsevier BV
Date: 04-2022
Drag characterisation of prawn-trawl bodies
Publisher: Elsevier BV
Date: 02-2016
Propulsive performance of the autonomous underwater vehicle C-SCOUT
Publisher: IEEE
Date: 2003
Experimental Investigation of a Highly Skewed Propeller in Ice
Publisher: ASME International
Date: 14-04-2001
DOI: 10.1115/1.1408942
Abstract: Ice tank experiments done to investigate the interaction of a highly skewed propeller with ice are described. An introduction to propeller-ice interaction, the test setup, and the main results from the work are presented. The test matrix was designed to investigate the effect of variations in ice cut depth and advance ratio on propeller shaft thrust and torque. The results are discussed in terms of design strength requirements for highly skewed propellers operating in ice.
Targeting Trimeric and Tetrameric Proanthocyanidins of Cinnamomum verum Bark as Bioactives for Dental Therapies
Publisher: American Chemical Society (ACS)
Date: 05-11-2020
The memorial explorer: Developing the role of AUVs in under-ice research
Publisher: IEEE
Date: 05-2010
Distribution of Arsenic and Copper in Sediment Pore Water: An Ecological Risk Assessment Case Study for Offshore Drilling Waste Discharges
Publisher: Wiley
Date: 12-2003
DOI: 10.1111/J.0272-4332.2003.00403.X
Abstract: Due to the hydrophobic nature of synthetic based fluids (SBFs), drilling cuttings are not very dispersive in the water column and settle down close to the disposal site. Arsenic and copper are two important toxic heavy metals, among others, found in the drilling waste. In this article, the concentrations of heavy metals are determined using a steady state "aquivalence-based" fate model in a probabilistic mode. Monte Carlo simulations are employed to determine pore water concentrations. A hypothetical case study is used to determine the water quality impacts for two discharge options: 4% and 10% attached SBFs, which correspond to the best available technology option and the current discharge practice in the U.S. offshore. The exposure concentration (CE) is a predicted environmental concentration, which is adjusted for exposure probability and bioavailable fraction of heavy metals. The response of the ecosystem (RE) is defined by developing an empirical distribution function of predicted no-effect concentration. The pollutants' pore water concentrations within the radius of 750 m are estimated and cumulative distributions of risk quotient (RQ=CE/RE) are developed to determine the probability of RQ greater than 1.
Re-analysis of the Akron Airship Pressure Data to Design Pressure Measurement Experiments on an Underwater Vehicle
Publisher: IEEE
Date: 09-2007
Manoeuvring Trials with the MUN Explorer AUV: Data Analysis and Observations
Publisher: IEEE
Date: 09-2007
Sizing a Hybrid Power System for Battle Harbour Island in Labrador
Publisher: SAGE Publications
Date: 05-2007
DOI: 10.1260/030952407783123097
Abstract: Battle Harbour is a small island in the Labrador Sea just off the South East coast of Labrador. Presently, electricity is generated on Battle Harbour using a diesel generator when the island is populated for 3 summer months per year. Due to its remote location, the fuel cost on Battle Harbour is very expensive. In this research we look into on-site renewable energy resources and conduct a feasibility study of a hybrid power system for Battle Harbour. We present one-year recorded power consumption data, wind, solar energy and hydro resources of the island and discuss options for reducing diesel consumption. Two cases are considered, a) load as usual b) load reduced by 50% after energy conservation measures. The sizing of the hybrid power system for both cases is discussed. This feasibility study indicates that by using a hybrid power system the diesel consumption on the island can be reduced to one sixth of its present annual consumption.
Analysis of horizontal zigzag manoeuvring trials from the MUN Explorer AUV
Publisher: IEEE
Date: 2008
Icing on a small horizontal-axis wind turbine — Part 1: Glaze ice profiles
Publisher: Elsevier BV
Date: 12-1992
MERLIN - A decade of large AUV experience at Memorial University of Newfoundland
Publisher: IEEE
Date: 11-2016
Applications of autonomous underwater vehicles in offshore petroleum industry environmental effects monitoring
Publisher: No publisher found
Date: 2009
DOI: 10.2118/09-05-12-GE
Aquaculture Net Drag Force and Added Mass
Publisher: Elsevier BV
Date: 07-2009
Periodic Gait Plans for Locomotion on Natural Terrain by a Submersible Walking Dredger/Miner
Publisher: IEEE
Date: 09-2007
Wave wake: Focus on vessel operations within sheltered waterways
Publisher: The Society of Naval Architects and Marine Engineers
Date: 2014
Experimental Study of Wave Induced Loads and Motions on FLNG in Head and Oblique Sea Waves
Publisher: American Society of Mechanical Engineers
Date: 19-06-2016
Abstract: In the past decade, an innovative concept, the floating liquefied natural gas (FLNG) system has been developed as a more effective solution over conventional pipelines for exploiting offshore natural gas resources. Understanding the hydrodynamic behaviour of such a mega structure in a real seaway is essential for determining its performance as well as evaluating the operabilities of on-board facilities and safe offloading. In this paper, experimental study on the hydrodynamic performance of a generic FLNG hull form has been presented. The 1:100 scale model was tested in the Australian Maritime College model test basin for head sea and oblique sea conditions at zero forward speed. The wave induced loads and motions were measured by load cells and linear variable differential transducers (LVDTs) respectively. Experimental uncertainties on each of the measured variables were studied by taking partial differentiations on the uncertainty sources. The time history measurements were decomposed by Fourier series for obtaining frequency domain force/moment and motion transfer functions. The results were compared with numerical solutions from potential flow and Reynolds-Averaged Navier-Stokes (RANS) solvers. A good correlation between the experimental and numerical results has been demonstrated.
Ice Loads Acting on a Model Podded Propeller Blade (OMAE2005-67416)
Publisher: ASME International
Date: 25-09-2006
DOI: 10.1115/1.2426993
Abstract: With the increase in popularity of podded propulsors and arctic navigation, understanding the interaction between a podded propulsor and ice has become more important. Propeller-ice interaction itself is a complicated process with a high level of uncertainty resulting from the uncertainties associated with the properties of the ice and with the propeller-ice interaction conditions. Model tests provide relatively well-controlled ice properties and interaction conditions to reduce the uncertainties. In order to improve the understanding of this interaction and to develop numerical models of it, a model podded propulsor was used in “Puller” mode, and ice loads were measured on its instrumented blade and propeller shaft. The results of the experiments conducted to simulate the interactions (milling) of the instrumented blade with ice in different operating conditions are reported in this paper. Loads measured during the milling consist of ice milling loads, “inseparable” hydrodynamic loads, and “separable” hydrodynamic loads. The s le results presented here include ice milling and inseparable hydrodynamic loads for various advance coefficients and depths of cut (amount of blade penetration into ice). Some results are compared with existing ice load models.
Distribution of heavy metals in sediment pore water due to offshore discharges: an ecological risk assessment
Publisher: Elsevier BV
Date: 06-2003
Risk analysis of man overboard scenario in a small fishing vessel
Publisher: Elsevier BV
Date: 06-2021
Modeling the dispersion of drilling muds using the bblt model: the effects of settling velocity
Publisher: Springer Science and Business Media LLC
Date: 05-08-2008
Human Health Risk Assessment of Naturally Occurring Radioactive Materials in Produced Water—A Case Study
Publisher: Informa UK Limited
Date: 12-2004
Large-scale experiments of a marine riser
Publisher: IEEE
Date: 2008
Wind turbine drives — Test results from the ‘falcon’
Publisher: Elsevier BV
Date: 07-1985
Measurements of the bodies and flukes of several cetacean species
Publisher: The Royal Society
Date: 22-12-1990
Design and Fabrication of a Collective and Cyclic Pitch Propeller
Publisher: ASMEDC
Date: 2004
Abstract: Helicopters achieve three-dimensional flight using a rotor capable of both collective and cyclic pitch. It was proposed that this type of propulsion system could propel and maneuver an underwater vehicle. A collective pitch and cyclic pitch propeller (CPCPP) was designed and developed as a full scale-working prototype for autonomous underwater vehicle (AUV) propulsion. This paper discusses the design and construction aspects of the CPCPP.
Alkylation of Naphthalene Over Mesoporous Ga-SBA-1 Catalysts
Publisher: Springer Science and Business Media LLC
Date: 14-04-2009
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