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Near-wall modelling and free-stream turbulence effects on square cylinder unsteady heat transfer

DOI: 10.1615/ICHMT.2015.THMT-15.560
pages 303-306

X. Chen
Department of Aeronautical and Automotive Engineering Loughborough University, Loughborough, Leicestershire, LE11 3TU, UK

H. Xia
Department of Aeronautical and Automotive Engineering Loughborough University, Loughborough, Leicestershire, LE11 3TU, UK

Résumé

Unsteady flow passing a heated square cylinder has been investigated using a hybrid LES-RANS approach at a moderate Reynolds number of 22, 050. Two near-wall RANS models are blended smoothly to the LES region. The two models applied have successfully reproduced time- and phase-averaged flow field. Encouraging convective heat transfer has been predicted. An increase in the convective heat flux is found on the cylinder top/bottom surface with imposed free-stream turbulence. More accurate prediction of velocity profiles as well as surface heat transfer is found by the LES- model.

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