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Turbulence Heat and Mass Transfer 6. Proceedings of the Sixth International Symposium On Turbulence Heat and Mass Transfer
September, 14-18, 2009, Rome, Italy

DOI: 10.1615/ICHMT.2009.TurbulHeatMassTransf


ISBN Print: 978-1-56700-262-1

ISSN: 2377-2816

Comparative study of DNS, LES and Hybrid LES/RANS of turbulent boundary layer over 2d hill

page 9
DOI: 10.1615/ICHMT.2009.TurbulHeatMassTransf.2200
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RESUMO

This paper presents evaluations for the prediction accuracy of various SGS models of LES under the simple condition of urban environment, i.e., various thermally-stratified turbulent boundary layers are calculated by evaluated LES models, namely, the Smagorinsky and the Mixed-Time-Scale models, the representative SGS model for the velocity field, and the constant turbulent Prandtl number model for the thermal field. These models are evaluated in comparison with a DNS database, in which the problems of LES in the prediction of various thermally-stratified boundary layers are elucidated. On the other hand, in order to evaluate the prediction accuracy of various models in a complicated turbulent flow field, the LES and the hybrid LES/RANS (HLR) models are examined in a turbulent boundary layer over a 2-dimensional hill. These results are assessed using newly-conducted DNS results of a 2-dimensional hill, and the prediction accuracy of these models is clarified in the calculation of a complicated turbulent flow field.

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