ORCID Profile
0000-0002-0518-430X
Current Organisation
University of Tasmania, Australian Maritime College
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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)
Ship and Platform Hydrodynamics | Maritime Engineering | Transport Engineering | Theoretical and Applied Mechanics | Applied Mathematics | Interdisciplinary Engineering Not Elsewhere Classified | Fluidization And Fluid Mechanics | Ship And Platform Hydrodynamics | Interdisciplinary Engineering | Naval Architecture | Ocean Engineering |
ANZSRC Socio-Economic Objective (SEO)
Environmentally Sustainable Transport not elsewhere classified | Commercial | Recreational services | Expanding Knowledge in Engineering | Public health not elsewhere classified | Passenger Water Transport | Port Infrastructure and Management | Wave Energy | Expanding Knowledge in the Mathematical Sciences | Coastal and Estuarine Water Management | Coastal Sea Freight Transport | International Sea Freight Transport (excl. Live Animal Transport)
Related Links
Publications
A PIV investigation of OWC operation in regular, polychromatic and irregular waves
Publisher: Elsevier BV
Date: 04-2017
The Design Limitations of a Circular Wave Pool
Publisher: American Society of Mechanical Engineers
Date: 08-06-2014
Abstract: In this paper, the design of a circular wave pool that produces continuously breaking waves is discussed, whereby a pressure source is rotated within an annular wave pool. The concept was that the pressure source generates non-breaking waves that propagate inward to the inner ring of the annulus, where a sloping bathymetry (beach) triggers wave breaking. In order to refine the technique, research was conducted to better understand the mechanics of waves generated by moving pressure sources in a constrained waterway, the transformation of these waves as they travel across the channel and the effect of the sloping beach on the wave quality for surfing. The quality of the waves was defined in terms of wave height, speed and shape, with the aim to create plunging waves, known as “barrels”, that are highly desired by surfers. A predominantly experimental approach was undertaken to determine the required design parameter values and their limitations. Scale model experimental results were previously presented at OMAE 2011 and OMAE2013. This paper presents the steps to design the pool using the empirical analysis and experimental results are presented. The effect of the pressure source and pool bathymetry on the currents formed in the pool, are also presented. Through this design process, high quality continuous breaking waves with the desired plunging shape were able to be generated. Finally, the authors are planning to use the facilities and techniques developed to investigate the complexities of predefined wave fields, including the three dimensional (3D) details of the velocity, pressure and turbulence fields beneath. Understanding these complexities within multidimensional wave patterns is the key to analysing a number of different fields, including wave resistance of ships wave disturbances to other maritime users bank erosion wave signal tracking and wave structure interaction.
Numerical hydrodynamic analysis of an offshore stationary–floating oscillating water column–wave energy converter using CFD
Publisher: Elsevier BV
Date: 2017
Model testing and performance comparison of plastic and metal tidal turbine rotors
Publisher: Elsevier BV
Date: 10-2015
An Experimental Study of Ship Motions During Replenishment at Sea Operations Between a Supply Vessel and a Landing Helicopter Dock
Publisher: Royal Institution of Naval Architects
Date: 06-2018
DOI: 10.3940/RINA.IJME.2018.A2.427
Abstract: Hydrodynamic interactions during Replenishment at Sea (RAS) operations can lead to large ship motions and make it difficult for vessels to maintain station during the operation. A research program has been established which aims to validate numerical seakeeping tools to enable the development of enhanced operator guidance for RAS. This paper presents analysis of the first phase of scale model experiments and focuses on the influence that both the lateral and longitudinal separations between two vessels have on the interactions during RAS. The experiments are conducted in regular head seas on a Landing Helicopter Dock (LHD) and a Supply Vessel (SV) in intermediate water depth. The SV is shorter than the LHD by approximately 17%, but due to its larger block coefficient, it displaces almost 16% more than the LHD. Generally, the motions of the SV were larger than the LHD. It was found that hydrodynamic interactions can lead to large SV roll motions in head seas. Directions for future work are provided.
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.
Spectrogram analysis of surface elevation signals due to accelerating ships
Publisher: American Physical Society (APS)
Date: 29-10-2021
In-situ orifice calibration for reversing oscillating flow and improved performance prediction for oscillating water column model test experiments
Publisher: Elsevier BV
Date: 04-2017
Investigation Into the Sensitivity of the Dynamic Hook Load During Subsea Deployment of a Suction Can
Publisher: ASMEDC
Date: 2007
Abstract: Suction cans are commonly used as foundations of fixed offshore structures, subsea equipment, and anchors of mooring lines. During the offshore installation phase, when a suction can is submerged, it attracts large heave added mass, which may be an order of magnitude higher than the mass of the can in air. Due to motions of an installation vessel the dynamic hook load may significantly exceed the submerged weight of the can. The dynamic hook load must be accurately predicted, as it governs selection of the vessel, lifting gear and rigging, and defines the allowable installation sea state. The objective of this paper is to examine the sensitivity of the dynamic hook load to hydrodynamic properties of the suction can, in particular its heave added mass and d ing. This research is motivated by the lack of data on such properties, which are usually estimated by simplified methods with some engineering judgement and assumptions. A single degree of freedom system is considered and the frequency domain spectral analysis is used, which employs the stochastic linearization of the nonlinear d ing component. The added mass and d ing of a 6-meter diameter suction can of dimensions typical for Australian North West Shelf developments have been determined by testing a 1:10 model in the 4.1 m deep basin of the Australian Maritime College. Free decay tests were conducted at several frequencies and the added mass, linear and nonlinear d ing components determined. The effect of open hatches on the hydrodynamic properties was examined by fitting the model with hatches of various diameters, with up to 4.8% of the relative area open. Results of the tests demonstrate that the added mass and d ing are higher, when compared with estimates based on empirical data for non-oscillatory flow. Within the Keulegan-Carpenter number range of 0.1–1.0, open hatches impact significantly on the added mass and produce additional d ing, which is found to be linear with the heave velocity. Results of the tests and their interpretation are discussed. Sensitivity analysis shows that if the model test results are used in the dynamic lift analysis for an installation vessel and sea states considered, the predicted hook load is generally less than its values obtained by using simplified estimates. In particular, the increase in linear d ing due to open hatches is responsible for up to 20% reduction in the dynamic hook load, with 2.4% of the relative top area open.
A Novel Method for Generating Continuously Surfable Waves—Comparison of Predictions With Experimental Results
Publisher: ASME International
Date: 22-05-2013
DOI: 10.1115/1.4023798
Abstract: In this paper, a novel idea to produce continuous breaking waves is discussed, whereby a pressure source is rotated within an annular wave pool, with the inner ring of the annulus having a sloping bathymetry to induce wave breaking. In order to refine the technique, work is being conducted to better understand the mechanics of surfable waves generated by moving pressure sources in restricted water. The pool aims to be capable of creating waves suitable for surfers from beginner to expert level, with an added benefit being by providing a safe learning environment, the overall surfing ability of the participants should be improved. The method of approach reported in this paper is the first stage of an experimental investigation of a novel method for generating continuously surfable waves utilizing a moving pressure source. The aim was to measure and assess the waves generated by two parabolic pressure sources and a wedge-shaped wavedozer (Driscoll, A., and Renilson, M. R., 1980, The Wavedozer. A System of Generating Stationary Waves in a Circulating Water Channel, University of Glasgow, Naval Architecture and Ocean Engineering, Glasgow, UK) for their suitability for future development of continuous breaking surfable waves. The tests were conducted at the University of Tasmania (UTas) Australian Maritime College (AMC) 100 m long towing tank. The predictions and experimental results for the wave height (H) at different values of depth Froude number (Frh) are presented in this paper. Finally, the preferred pressure source is determined based on the wave making energy efficiency and the quality of the waves for surfing.
Marine Vessel Wave Wake: Transient Effects When Accelerating or Decelerating
Publisher: American Society of Civil Engineers (ASCE)
Date: 2019
Effect of RANSbased Turbulence Models on Nonlinear Wave Generation in a TwoPhase Numerical Wave Tank
Publisher: Inderscience Publishers
Date: 2016
Experimental investigation of multiple Oscillating Water Column Wave Energy Converters integrated in a floating breakwater: Energy extraction performance
Publisher: Elsevier BV
Date: 04-2020
Wave wake: Focus on vessel operations within sheltered waterways
Publisher: The Society of Naval Architects and Marine Engineers
Date: 08-2014
A Novel Method for Generating Continuously Surfable Waves
Publisher: Marine Technology Society
Date: 03-2010
DOI: 10.4031/MTSJ.44.2.2
Abstract: Abstract This paper presents the background and initial investigation of a novel method for generating continuously surfable waves utilizing a moving pressure source. The idea is to produce continuous breaking waves using a pressure source that is rotated within an annular wave pool. The inner ring of the annulus has a sloping bathymetry to induce wave breaking. The underlying aim of the project is to understand the wave mechanics, to allow the creation of repeatable continuous “steady-state” waves.The immediate benefits of this scientific investigation will be realized by engineering the results into a surfing wave pool for recreational health use. The longer-term benefits will be developed through fundamental investigations of breaking waves.Preliminary experiments into creating a continuous steady-state wave were conducted in a towing tank using a series of pressure sources. The results have then been used to validate an initial numerical study. In addition, qualitative, full-scale experiments were carried out using a fishing vessel in a river estuary. This paper reports on the research conducted to date and plans for future work, including conducting experiments utilizing a 10-metre-diameter scale model.
Hydrodynamic performance of single–chamber and dual–chamber offshore–stationary Oscillating Water Column devices using CFD
Publisher: Elsevier BV
Date: 10-2018
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.
Limitations on the Creation of Continuously Surfable Waves Generated by a Pressure Source Moving in a Circular Path
Publisher: American Society of Mechanical Engineers
Date: 09-06-2013
Abstract: In this paper, a novel idea to produce continuous breaking waves is discussed, whereby a pressure source is rotated within an annular wave pool. The concept was that the pressure source generates non-breaking waves that propagate inward to the inner ring of the annulus, where a sloping bathymetry (beach) triggers wave breaking. In order to refine the technique, research was conducted to better understand the mechanics of waves generated by a pressure source moving in a circular track in a constrained waterway, the transformation of these waves as they travel across the channel and the effect of the sloping beach on the wave quality for surfing. The quality of the waves was defined in terms of wave height, speed and shape, with the desired aim to create plunging waves, known as “barrels”, that are highly desired by surfers. Surfers also require a long steep crestline or “wall”, to allow a full range of manoeuvres to be performed. Finally, the pool needed to be able to create waves suitable for surfers from beginner to expert level, defined in terms of both the wave height and angle between the wave break point angle and the beach, known a peel angle. The primary novel outcome of the research conducted was to be able to design a pressure source that most efficiently imparted wave making energy into the water, and thus generated the largest possible waves whilst travelling at the required speed for surfing. The major finding was that the design parameters are generally in competition, and to determine a balance of limiting values, the design parameters cannot be considered in isolation. Therefore, a set of empirical relationships between the design parameters were developed to allow the pool to be designed for a combination of desired wave height at the breakpoint, wave shape and given pool radius. The limiting values for the parameters were determined experimentally, with the wave life-cycle from generation through transformation to wave breaking and dissipation used to focus the investigation. Scale model experiments were conducted in both linear and circular tracks. In addition to taking quantitative measurement of wave height and current formation, a method of qualitatively scoring the waves was developed to allow various pressure source shapes, operating conditions and bathymetries to be compared in terms of their suitability for surfing. The best quality waves were produced by a wedge-shaped wavedozer pressure source, such as the device detailed in Driscoll and Renilson [1]. Blockage, defined as the pressure source cross sectional area to channel cross-sectional area, was found to have a significant limitation on the generation of high quality waves suitable for surfing in a constrained waterway. Lateral wave decay, length and depth Froude Numbers also strongly influenced the waves during their life-cycle. Fundamentally, it was determined that only a very small range of design parameter values produce the desired high and shapely waves in the extremely constrained waterway under consideration.
Rapid assessment of boat-generated waves within sheltered waterways
Publisher: Informa UK Limited
Date: 2014
Nonlinear hydrodynamic effects on a generic spherical wave energy converter
Publisher: Elsevier BV
Date: 04-2018
Experimental investigation of multiple oscillating water column wave energy converters integrated in a floating breakwater: Wave attenuation and motion characteristics
Publisher: Elsevier BV
Date: 06-2020
Insight into the Flow Within the Well Dock of a Mothership During Feeder Vessel Docking Manoeuvres
Publisher: Royal Institution of Naval Architects
Date: 03-2020
DOI: 10.3940/RINA.IJME.2020.A1.492
Abstract: An experimental c aign has been undertaken to explore the flow around a feeder vessel as it manoeuvres in and out of the well dock of a mothership. The parent hulls for this study are drawn from the floating harbour transhipper concept created by Sea Transport Corporation. Laser measurement techniques have been employed to analyse the flow field within the well dock while the feeder vessel both enters and departs. For the Master of the feeder vessel to safely perform these manoeuvres, the complex flows resulting from the highly confined nature of the well dock concept need to be understood and potentially mitigated. It is shown that the inclusion of vents in the well dock can significantly influence the flow and that their effectiveness is determined by the size of the vents. This study further progresses the authors’ recent work on the same novel concept where the confined water effect of the well dock and inclusion of vents is quantified for both the seakeeping behaviour and the docking/departure performance. It is concluded that the use of vents is very beneficial when a feeder vessel docks or departs the well dock, however a compromise on the vent size must be reached in order to reduce adverse effects on feeder vessel motions when docked and exposed to a seaway. It is likely that the optimum solution, that covers all operational parameters, only requires the inclusion of relatively small vents.
Experimental flow field comparison for a series of scale model oscillating water column wave energy converters
Publisher: Elsevier BV
Date: 03-2017
Heave Added Mass and Damping of a Suction Can in Proximity to the Sea Floor
Publisher: ASMEDC
Date: 2008
Abstract: Suction cans are usually deployed by the crane of a construction vessel, which must have adequate capacity to withstand the dynamic hook loads generated by motions of the vessel and heave response of the suction can. Before the structure is placed on the sea floor, it must be positioned above the target location in this phase the suction can is manoeuvred into position being suspended in proximity to the sea floor. Hydrodynamic properties of the structure in the positioning phase are different from those experienced during the decent, due to the effect of the bottom proximity. As a result, the dynamic hook loads experienced in this phase may be also different from the deep water condition. The objective of this study is to quantify these effects in particular the impact of the bottom proximity on the heave added mass and hydrodynamic d ing. The added mass and d ing of a 6-metre diameter suction can, of dimensions typical for Australian North West Shelf conditions, have been determined by testing a 1:10 model in the 4.2 m deep water tank of the Australian Maritime College. Free decay tests were conducted at several heave frequencies, and the heave added mass and d ing determined. Four clearances of the model from the sea floor were investigated ranging from 1.20 to 0.20 of the can height. For each clearance, several sizes of open hatches were examined, by testing the model with 3 pairs of hatches of various diameters, with up to 4.8% of the relative area open. Model tests demonstrate that the heave added mass and d ing increase as the suction can approaches the sea floor. Increase in added mass is found to be within 20% of its deep water value, and is made less pronounced by opening hatches of larger area. Linear (proportional to velocity) hydrodynamic d ing also increases moderately as the under-bottom clearance reduces. Quadratic (proportional to velocity squared) d ing is strongly affected, especially at very small clearances, with drag coefficient reaching unusually high values this is attributed to substantial constraining effect of the bottom, which causes increasing flow velocities past the lower edge of the can. Results of the tests are presented, and their application for the installation lift analysis is discussed.
PIV investigation of 3-dimensional flow within an oscillating water column
Publisher: Elsevier BV
Date: 09-2015
Improving OWC performance prediction using polychromatic waves
Publisher: Elsevier BV
Date: 12-2015
Time-frequency analysis of ship wave patterns in shallow water: modelling and experiments
Publisher: Elsevier BV
Date: 06-2018
Scaling and air compressibility effects on a three-dimensional offshore stationary OWC wave energy converter
Publisher: Elsevier BV
Date: 03-2017
Effect of RANS-based turbulence models on nonlinear wave generation in a two-phase numerical wave tank
Publisher: Inderscience Publishers
Date: 2017
Energy balance analysis for an oscillating water column wave energy converter
Publisher: Elsevier BV
Date: 11-2012
Numerical energy balance analysis for an onshore oscillating water column–wave energy converter
Publisher: Elsevier BV
Date: 12-2016
Investigation Into Float-Over Installations of Minimal Platforms by Hydrodynamic Model Testing
Publisher: ASMEDC
Date: 2005
Abstract: The idea of using float-over installations for minimal facilities platforms was shown to offer significant advantages, especially when coupled with a substructure installed by a jack-up rig. Recently, float-over installations of minimal facilities have been conducted by the cantilevered method by ICON Engineering Pty Ltd (ICON). The operation involves the platform topsides being loaded and transported to site on a barge, skidded over the barge bow, and lowered onto the jacket. The paper presents results of a research project undertaken by the Australian Maritime College (AMC) in conjunction with ICON, with the objective to investigate motions of a barge and loads exerted on the jacket when the two are docked together for a smooth load transfer operation. The model of an installation barge has been tested in the AMC wave basin and response litude operators of the barge motions have been determined for both the free floating and docked conditions. A range of wave periods and heights has been investigated. Model test results have been used to verify numerical predictions used in the design, and to get insight into uncertainties, which may otherwise be difficult to assess using standard software.
Hydrodynamic Properties of a Suction Can Oscillating Near the Free Surface
Publisher: ASMEDC
Date: 2009
Abstract: Offshore operations often require heavy subsea equipment, such as suction piles or cans, to be lowered by a support vessel into the sea. A lifting device must have adequate capacity to withstand the dynamic loads generated by the motions of the vessel and the heave response of the structure. The objective of this study is to determine the added mass and d ing of a suction can oscillating in heave near the free surface knowledge of these hydrodynamic properties is required for the accurate prediction of the dynamic lift forces during the deployment. This project is a logical progression following two similar studies, which investigated these hydrodynamic properties for the suction can in the mid-water position and when approaching the seabed. All three studies involved the conduct of model tests to determine the hydrodynamic properties. Free decay tests were conducted at several heave frequencies, and the added mass, linear and quadratic d ing components were determined. In addition, the effect of varying the percentage of open hatch area has been investigated. Test data demonstrates that the heave added mass is strongly dependent on the frequency of motion, and its values are significantly smaller than those measured in the unrestricted flow. From observations, there was no dependency on the motion litude, nor did the size of open hatches have notable effect on the added mass. It was observed that when the top plate of the structure was in contact with the free surface a mean “pull down” force appeared. This force is caused by the suction underneath the top plate when the can moves upwards. As opposed to the mid-water position and near the sea floor, the study indicates that the area of open hatches has no noticeable effect on the heave d ing when the suction can is oscillating near the free surface.
Water stilling for towing tank seakeeping experiments
Publisher: Informa UK Limited
Date: 2007
Underwater geometrical impact on the hydrodynamic performance of an offshore oscillating water column–wave energy converter
Publisher: Elsevier BV
Date: 05-2017
Investigations on 3D effects and correlation between wave height and lip submergence of an offshore stationary OWC wave energy converter
Publisher: Elsevier BV
Date: 03-2017
Extensions of the Cayley-Hamilton Theorem to Transfer Matrices of Linear Systems
Publisher: CRC Press
Date: 14-07-2017
Application of photogrammetry for spatial free surface elevation and velocity measurement in wave flumes
Publisher: SAGE Publications
Date: 10-09-0001
Abstract: This article presents a method for obtaining the spatial free surface elevation and velocity field for the water surface in a wave flume over a relatively large measurement area for this type of application (approximately 1.5 m × 1.5 m). The technique employs proprietary videogrammetry software to post-process stereo images captured by multiple synchronised machine vision cameras. Dimensional resolution and other limitations are similar to that experienced for particle imaging velocimetry systems ( x, y resolution of 2 mm). Imaging of the free surface was enabled by the use of millions of bespoke slightly positively buoyant fluorescent flakes. Ultraviolet light was used as the primary light source to excite the fluorescent flakes. Reflected ultraviolet light was attenuated by a high-pass filter fitted to the cameras so that only the emitted light from the fluorescent flakes was visible. The software was validated using a simple linear translation experiment. An application is demonstrated for the radiated wave field generated from a submerged sinusoidal heaving sphere for two cases: one single and five consecutive oscillations. Results agree with linear wave theory which indicates that the floating flakes had minimal impact on the water surface particle motion at the scale tested. It is, therefore, concluded that spatial measurement of the free surface elevation and velocity using the method presented has good resolution over a large measurement field. The flakes were found to follow the free surface well, but the measurement area is constrained to where the pattern of flakes exists in the image. Hence, application of floating markers is not suitable for experiments with significant outflow/upwelling which would wash away the floating markers from the intended measurement area.
Novel experimental modelling of the hydrodynamic interactions of arrays of wave energy converters
Publisher: Elsevier BV
Date: 12-2017
Performance analysis of a floating breakwater integrated with multiple oscillating water column wave energy converters in regular and irregular seas
Publisher: Elsevier BV
Date: 06-2020
A Novel Method for Generating Continuously Surfable Waves: Comparison of Predictions With Experimental Results
Publisher: ASMEDC
Date: 2011
Abstract: In this paper, a novel idea to produce continuous breaking waves is discussed, whereby a pressure source is rotated within an annular wave pool. The concept is that the inner ring of the annulus has a sloping bathymetry to induce wave breaking from the wake of the pressure source. In order to refine the technique, work is being conducted to better understand the mechanics of surfable waves generated by moving pressure sources in restricted water. This paper reports on the first stage of an experimental investigation of a novel method for generating continuously surfable waves utilising a moving pressure source. The aim was to measure and assess the waves generated by two parabolic pressure sources and a wavedozer [1] for their suitability for future development of continuous breaking surfable waves. The tests were conducted at the Australian Maritime College (AMC), University of Tasmania (UTas) 100 metre long towing tank. The experimental results as variations in wave height (H) ided by water depth (h) as functions of depth Froude number (Frh) and h, together with predictions from both methods, are presented in this paper. Finally, measures of the wave making energy efficiency of each pressure source, and the surfable quality of the waves generated by it, were developed and are presented.
Wave wake: Focus on vessel operations within sheltered waterways
Publisher: The Society of Naval Architects and Marine Engineers
Date: 2014
Experimental and numerical measurements of wave forces on a 3D offshore stationary OWC wave energy converter
Publisher: Elsevier BV
Date: 11-2017
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.
Preliminary investigation on the use of tank wall reflections to model WEC array effects
Publisher: Elsevier BV
Date: 09-2018
Experimental and numerical investigations on the hydrodynamic performance of a floating–moored oscillating water column wave energy converter
Publisher: Elsevier BV
Date: 11-2017
Experimental and numerical investigations on the intact and damage survivability of a floating–moored oscillating water column device
Publisher: Elsevier BV
Date: 10-2017
The Increase in Wave Wake Characteristics of Marine Vessels When Accelerating
Publisher: American Society of Mechanical Engineers
Date: 09-06-2019
Abstract: The waves generated by ships and boats (often referred to as wake wash, wave wake or simply wash) have been known to result in the erosion of riverbanks, damage to maritime structures, or be hazardous to other users of the waterway. The vast majority of research in this field to date has focused on the characteristics of these waves when the vessel is travelling at constant forward speed. Recent work by the authors has identified significant transient effects that occur while a vessel accelerates up to the desired operational speed, where both the height and period of the maximum wave generated are significantly greater than those generated at the corresponding steady-state speed. This notable increase in wave energy can be important, particularly where vessels are required to accelerate on a regular basis when operating in sheltered waterways with limited water depth. Common ex les are commuter ferries that make regular passages between passenger terminals and hence pass through the transcritical speed zone to operate at supercritical speeds (in terms of depth Froude number). In this paper, a study into these transient effects through physical scale-model experimentation is expanded to include different hull forms, including a typical “low wash” catamaran river ferry and a prismatic monohull. Results indicate that the increase in height of the maximum wave can exceed 80% and the period of this wave increase by more than 30% as a result of the acceleration phase compared to the steady-state speed. This poses the question whether these transient effects should form part of the assessment process when considering whether a vessel meets criteria imposed to regulate wash impacts. The same model scale data is also used to advise the model test community the required distance for a ship model to achieve a steady-state following the acceleration phase during model scale tests in facilities such as towing tanks or basins.
Related Organisations
University Of Tasmania, Australian Maritime College
Location: Australia
Related Funding Activities
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