Search Results - Reynolds, J.W~
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Large Eddy simulations of high Reynolds number jets with microjet injection
Published 2014“…While bypass ratio has been the historical, and rather convenient means, of reducing jet noise, an upper limit to bypass ratio is now being approached and additional means of reducing jet noise must be found. …”
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Influence of the Reynolds number on the instant flow evolution of a turbulent rectangular free jet of air
Published 2014“…The paper is aimed at investigating the influence of the Reynolds number on the instant flow evolution of a rectangular free jet of air in the range of Reynolds numbers from Re = 35,300 to Re = 2,200, where the Reynolds number, Re, is defined according to the hydraulic diameter, D, of a rectangular slot of height H, equal to about D = 2H. …”
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Two-dimensional pulse dynamics and the formation of bound states on electrified falling films
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Numerical evidence of an undisturbed region of flow in a turbulent rectangular submerged free jet
Published 2016“…Moreover, URF has a self-similar behavior and a new law for the evolution of the momentum is proposed.…”
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Crowdsourcing hypothesis tests: Making transparent how design choices shape research results
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Influence of nozzle exit conditions on the near-field development of high subsonic and underexpanded axisymmetric jets
Published 2018“…Detailed knowledge of jet plume development in the near-field (the first 10–15 nozzle exit diameters for a round jet) is important in aero-engine propulsion system design, e.g., for jet noise and plume infrared (IR) signature assessment. …”
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Propulsive jet aerodynamics and aeroacoustics
Published 2021“…Comprehensive understanding of propulsive jet aerodynamics and aeroacoustics is key to engine design for reduced jet noise and infra-red signature in civil and military aerospace, respectively. …”
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Salient three-dimensional features of the turbulent wake of a simplified square-back vehicle
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Turbulent free jet simulations with LES and ILES based on NFT MPDATA
Published 2022“…The capabilities of both the LES and ILES approaches to predict essential turbulent free jets are evaluated in the presented work, with LES carried out at Reynolds number Re = 1.1 × 104. …”
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LES-deduced acoustic modelling for jet noise
Published 2021“…Finally, modelling results have compared favourable to experimental far-field noise data for both round and serrated jets showing superior high-frequency noise predictive capabilities to FW-H thereby demonstrating the advantages of the acoustic modelling approach.…”
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Large eddy simulation to extract fourth order space time turbulence correlations in jets including microjet injection
Published 2011“…Computationally expensive Large Eddy Simulations can be used to assess the four-order spatio-temporal correlations so as to provide input and guidance to cheaper jet noise models. Large Eddy Simulations are presented for an isothermal Mach 0.75 jet at a Reynolds number of 1 million with and without microjet injection. …”
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Stereo-PIV measurements of spatio-temporal turbulence correlations in an axisymmetric jet
Published 2015“…Restricting attention to subsonic, isothermal jets, measurements were taken in a water flow experiment where, for the same Reynolds number and nozzle size, the shortest time scale of the dynamically important turbulent structures is more than an order of magnitude greater that in equivalent airflow experiments, greatly facilitating time-resolved PIV measurements. …”
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A study of nozzle exit boundary layers in high-speed jet flows
Published 2006“…The requirement for reduced jet noise in order to meet stringent noise legislation (civil aviation), and low infra-red observability and the use of unconventional exhaust nozzle configurations to improve aircraft survivability and performance (military aviation) is driving research to develop a better understanding of jet development and mixing mechanisms. …”
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Explicit and implicit large eddy simulations of free jets
Published 2021“…The capabilities to adequately capture essential turbulent free jet features in both the LES and ILES approaches are demonstrated in the presented work, with the LES simulations carried out at Reynolds number Re = 1.0×104 . …”
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Jet noise analysis using an efficient LES/high-order acoustic coupling method
Published 2020“…The present LES/APE framework is fist validated for 3D jet applications by studying the noise propagation of a low-Reynolds number case. …”
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Turbulent jet characteristics for axisymmetric and serrated nozzles
Published 2014“…Turbulent jet large eddy simulations (LES) are performed at Mach 0.9 and Reynolds number around 106 . …”
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Effects of the turbulence model and the spray model on predictions of the n-heptane jet fuel–air mixing and the ignition characteristics with a reduced chemistry mechanism
Published 2017“…In this study, we also use the entrainment gas-jet model, modifications of the the spray model coefficient and two turbulence models to investigate extensively the influence of the gas-jet theory model on the fuel–air mixture process. …”
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LES of turbulent liquid jet primary breakup in turbulent coaxial air flow
Published 2013“…The proposed numerical approach showed excellent robustness and high accuracy in predicting coaxial liquid jet primary breakup. Since strong turbulence structures will develop inside the injector at high Reynolds numbers and affect the subsequent primary breakup, the Rescaling and Recycling Method (RM) was implemented to facilitate generation of appropriate unsteady LES inlet conditions for both phases. …”
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Large Eddy Simulation of acoustic pulse propagation and turbulent flow interaction in expansion mufflers
Published 2015“…A novel hybrid pressure-based compressible solver is developed and validated for low Mach number acoustic flow simulation. The solver is applied to the propagation of an acoustic pulse in a simple expansion muffler, a configuration frequently employed in HVAC and automotive exhaust systems. …”
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A coupled LES/high-order acoustic method for jet noise analysis
Published 2019“…The parallel interface coupling framework is then tested on a low Reynolds number jet, being validated against experimental and numerical results in the literature, during which a well-established FWH method is used for references. …”
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Performance and accuracy of high-order accurate large-eddy simulations for gas turbine combustor aerodynamics
Published 2022“…Here, the flow parameters such as Reynolds numbers, flow split and Swirl number are representative of realistic combustors. …”
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Passive scalar diffusion in three-dimensional turbulent rectangular free jets with numerical evaluation of turbulent Prandtl/Schmidt number
Published 2018“…The passive scalar spreading of fluids with laminar Prandtl or Schmidt number, Pr,Sc, equal to 1 in turbulent rectangular submerged free jets is analyzed by means of numerical simulation and theoretical analysis in the Reynolds number range 5000-40,000. …”
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Film thickness investigation in heavily loaded hypoid gear pair elastohydrodynamic conjunctions
Published 2015“…Prediction of wear rate and generated friction require determination of lubricant film thickness. However, only very few investigations have addressed the issue of thin elastohydrodynamic films in hypoid gear pairs. …”
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A joint velocity-intermittency analysis reveals similarity in the vertical structure of atmospheric and hydrospheric canopy turbulence
Published 2019“…The approach reveals behavior that provides greater insight into canopy fow dynamics than may be inferred from the vertical profles of mean velocity, turbulence intensity and Reynolds stresses, which are the quantities usually studied. …”
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Supplementary information files for 'A joint velocity-intermittency analysis reveals similarity in the vertical structure of atmospheric and hydrospheric canopy turbulence'
Published 2019“…The approach reveals behavior that provides greater insight into canopy fow dynamics than may be inferred from the vertical profles of mean velocity, turbulence intensity and Reynolds stresses, which are the quantities usually studied. …”
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Thermal simulation of ventilated PV-facades
Published 2006“…Comparison of CFD simulations and PIV measurements showed good agreement for different symmetric and asymmetric plate temperatures as well as for different forced flow rates. A new Nusselt correlation was developed, which was derived from a CFD parameter study. …”
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