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ASSESSMENT OF LES AND RANS PREDICTIONS OF IMPINGING FLOWS

S. Rhea
Department of Mechanical Engineering, Imperial College London, London SW7 2AZ, UK

M. Bini
Department of Mechanical Engineering, Imperial College London, London SW7 2AZ, UK

Michael Fairweather
School of Chemical and Process Engineering, University of Leeds, Leeds, LS2 9JT, UK

W. P. Jones
Mechanical Engineering Department, Imperial College London London, SW7 2AZ, UK

Abstrakt

RANS modelling and LES of a plane air jet impinging orthogonally on a flat surface is described. Comparisons of predictions are made with the data of Yoshida et al. (1990), with good agreement found in both the free and wall jet regions. Some under-prediction, particularly by the RANS approach, of turbulence quantities is apparent, and overall the LES is in closer agreement with data, particularly in zones where large turbulent structures dominate. Differences in LES and RANS for the flow considered are not large, however, and this may be attributed to the effort already expended in the development of second-moment turbulence closures with wall reflection effects for impinging flow application. The results presented go some way towards validating LES for application to high Reynolds number impinging flows, although uncertainties in the data set used for comparison purposes demonstrate a requirement for further experimental work.