Elliptical nozzles: the shape of silence? This project aims to leverage the aeroacoustic properties of elliptical nozzle geometries to significantly reduce installed jet noise. This project expects to generate new knowledge regarding methods to reduce installed jet noise, a serious problem for the aerospace industry. Regulatory constraints inhibit the implementation of efficiency-increasing configurations but still fail to eliminate public health impacts. Expected outcomes include a set of tools ....Elliptical nozzles: the shape of silence? This project aims to leverage the aeroacoustic properties of elliptical nozzle geometries to significantly reduce installed jet noise. This project expects to generate new knowledge regarding methods to reduce installed jet noise, a serious problem for the aerospace industry. Regulatory constraints inhibit the implementation of efficiency-increasing configurations but still fail to eliminate public health impacts. Expected outcomes include a set of tools for optimizing nozzle designs capable of significantly reducing installed jet noise. This will provide significant benefits, as jet noise is a serious health issue for the Australian public. This project represents an opportunity to reduce its impact while improving fuel efficiency.Read moreRead less
Understanding combustion in gasoline compression ignition conditions. This project aims to provide the first fundamental-level understanding of the processes of ignition, combustion, and pollutant formation relevant to a new, highly efficient combustion mode known as gasoline compression ignition (GCI). This project aims to provide information using a unique combination of direct numerical simulations, advanced transported probability density function modelling and a suite of laser measurements ....Understanding combustion in gasoline compression ignition conditions. This project aims to provide the first fundamental-level understanding of the processes of ignition, combustion, and pollutant formation relevant to a new, highly efficient combustion mode known as gasoline compression ignition (GCI). This project aims to provide information using a unique combination of direct numerical simulations, advanced transported probability density function modelling and a suite of laser measurements in a high-pressure combustion chamber. GCI engines have significant potential to improve fuel economy and reduce emissions harmful to health and the environment. The outcomes from this project will lead to accelerated development of the GCI engine, and more optimal GCI solutions to be found.Read moreRead less
Advanced Combustion Modelling for Scramjets and Rotating Detonation Engines. This project will develop new fundamental knowledge and engineering models underpinning air-breathing high speed propulsion engines employing complex hydrocarbon fuels. Extensive data and new physical understanding will be garnered through analysis of direct numerical simulations of supersonic reacting mixing layers including impinging shock waves. That data will be employed to isolate, test and develop computationally ....Advanced Combustion Modelling for Scramjets and Rotating Detonation Engines. This project will develop new fundamental knowledge and engineering models underpinning air-breathing high speed propulsion engines employing complex hydrocarbon fuels. Extensive data and new physical understanding will be garnered through analysis of direct numerical simulations of supersonic reacting mixing layers including impinging shock waves. That data will be employed to isolate, test and develop computationally efficient engineering models that are accurate and efficient for high speed combustion in rotating detonation engines and scramjets. Expected outcomes are knowledge and tools needed to develop practical and effective supersonic propulsion engines for access to space, defence and high speed point-to-point flight.
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Wall turbulence control: beyond the canonical smooth wall case. This project aims to fill a critical knowledge gap in the area of wall turbulence by investigating how a rough wall turbulent boundary layer responds to changes, such as wall suction and blowing. The economic and environmental costs caused by the roughening of surfaces on moving vehicles is staggering in the transport industry (roads, rails, air and sea) and ultimately for Australia. This project will generate new knowledge to ascer ....Wall turbulence control: beyond the canonical smooth wall case. This project aims to fill a critical knowledge gap in the area of wall turbulence by investigating how a rough wall turbulent boundary layer responds to changes, such as wall suction and blowing. The economic and environmental costs caused by the roughening of surfaces on moving vehicles is staggering in the transport industry (roads, rails, air and sea) and ultimately for Australia. This project will generate new knowledge to ascertain whether or not turbulent flows over rough surfaces can be controlled or managed to achieve outcomes such as reducing the drag of a roughened bluff body, for example a ship whose hull is roughened by fouling. The project expects to improve understanding of wall turbulence control, and will lead to significant benefits such as improved control technologies and better prediction and description of wall turbulence.Read moreRead less
The cost of roughness: predicting the drag penalty of fouled ship hulls. Roughness on ship hulls is a prevalent global problem, causing up to 80% increases in resistance compared to ideal smooth surfaces. Targeting a key capability gap, this project aims to build practical tools for predicting the performance penalty in shipping due to hull roughness, requiring only hull observations as an input. Observations made with a custom-built underwater surface scanner will be combined with world-first l ....The cost of roughness: predicting the drag penalty of fouled ship hulls. Roughness on ship hulls is a prevalent global problem, causing up to 80% increases in resistance compared to ideal smooth surfaces. Targeting a key capability gap, this project aims to build practical tools for predicting the performance penalty in shipping due to hull roughness, requiring only hull observations as an input. Observations made with a custom-built underwater surface scanner will be combined with world-first laser-based flow measurements on the hull of an operating ship, and backed-up by complimentary laboratory experiments. This project will deliver an advanced fundamental understanding of hull roughness and enable more informed decisions for ship operators and regulatory bodies, leading to increased shipping efficiency.Read moreRead less
The effect of non-homogeneous roughness on full-scale drag predictions. Partnering with AkzoNobel, one of the world’s leading suppliers of anti-fouling marine coatings, this project will deliver new tools for predicting the drag penalty on ships fouled by the settlement of marine organisms on the hull. All available predictions assume a homogeneous distribution of roughness. Yet we know biofouling is always patchy, hence prediction methods need an upgrade. Making a compelling business case to sh ....The effect of non-homogeneous roughness on full-scale drag predictions. Partnering with AkzoNobel, one of the world’s leading suppliers of anti-fouling marine coatings, this project will deliver new tools for predicting the drag penalty on ships fouled by the settlement of marine organisms on the hull. All available predictions assume a homogeneous distribution of roughness. Yet we know biofouling is always patchy, hence prediction methods need an upgrade. Making a compelling business case to ship operators is contingent on such predictions, where the cost of anti-fouling solutions is weighed against that of continued operation with a rough hull. The novel tools developed here will therefore lead to increased ship efficiency by empowering ship operators to optimise hull cleaning and repainting schedules.
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Unravelling the enigma of turbulence by integrating simulation & modelling. This project will transform how turbulence and flow-induced noise is understood and predicted to help meet the challenge of ever-growing transport and energy demands in an affordable and sustainable way. This will be achieved by integrating the latest simulation advances with unique machine-learning approaches. The expected outcome will be a paradigm shift in how turbulence and noise models are created and used, informed ....Unravelling the enigma of turbulence by integrating simulation & modelling. This project will transform how turbulence and flow-induced noise is understood and predicted to help meet the challenge of ever-growing transport and energy demands in an affordable and sustainable way. This will be achieved by integrating the latest simulation advances with unique machine-learning approaches. The expected outcome will be a paradigm shift in how turbulence and noise models are created and used, informed by new scientific knowledge and data. The proliferation of these new models will allow the design and operation of more efficient, reliable and quieter technologies in the aerospace, naval and energy industries, benefitting the Australian economy and environment, and raise the international profile of our scientists.Read moreRead less
The Transitional and Turbulent Structure of Rotating Disk Boundary Layers. Design optimization in areas of energy, materials processing, manufacturing and aerodynamics often depends on fluid flows adjacent to surfaces (wall-flows), and many such flows are three-dimensional (3-D). At present, 3-D wall-flows are poorly understood, and thus we aim to provide the first comprehensive study of the prototypical 3-D wall-flow on a rotating disk. Experiments in a bespoke facility will cover the importan ....The Transitional and Turbulent Structure of Rotating Disk Boundary Layers. Design optimization in areas of energy, materials processing, manufacturing and aerodynamics often depends on fluid flows adjacent to surfaces (wall-flows), and many such flows are three-dimensional (3-D). At present, 3-D wall-flows are poorly understood, and thus we aim to provide the first comprehensive study of the prototypical 3-D wall-flow on a rotating disk. Experiments in a bespoke facility will cover the important flow regimes (transitional and turbulent), and novel sensors will quantify the detailed 3-D flow structure. By clarifying critical instability scenarios and revealing turbulent flow scaling structure, this project will fundamentally advance physical understanding and analytical and computational models of 3-D wall-flowsRead moreRead less
Dissecting non-equilibrium effects in wall turbulence. This project aims to progress understanding of wall-bounded turbulent flows under non-equilibrium conditions. The focus is on turbulent flows over rough surfaces where the bulk flow decelerates along the streamwise length of the surface. Such flows are regularly encountered in important practical applications, such as over the trailing edge of an airplane wing or inside a flow diffuser, which are ubiquitous in industry. Novel experiments and ....Dissecting non-equilibrium effects in wall turbulence. This project aims to progress understanding of wall-bounded turbulent flows under non-equilibrium conditions. The focus is on turbulent flows over rough surfaces where the bulk flow decelerates along the streamwise length of the surface. Such flows are regularly encountered in important practical applications, such as over the trailing edge of an airplane wing or inside a flow diffuser, which are ubiquitous in industry. Novel experiments and numerical simulations will provide the definitive data needed in order to uncover the scaling laws of these flows, thus enabling their reliable prediction.Read moreRead less
Fluid-Structure Interactions in Flows through Flexible-Walled Channels. This project seeks to deliver a definitive understanding of the behaviour of steady and pulsating fluid flow through compliant-walled channels and pipes. Novel theoretical stability-analyses and experimental investigations, complemented by targeted numerical simulations, will be developed and used to identify and categorise fluid- and wall-based wave-disturbances and their interactions. This can underpin the development of t ....Fluid-Structure Interactions in Flows through Flexible-Walled Channels. This project seeks to deliver a definitive understanding of the behaviour of steady and pulsating fluid flow through compliant-walled channels and pipes. Novel theoretical stability-analyses and experimental investigations, complemented by targeted numerical simulations, will be developed and used to identify and categorise fluid- and wall-based wave-disturbances and their interactions. This can underpin the development of technologies that control these flows to advantage in both engineered fluid-flow and biologically occurring systems. Robust design guidelines will emerge to safeguard and enhance the use of compliant liners and flexible panels for drag and noise reductions, or to protect surfaces exposed to fluid flows. Read moreRead less