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RANS and Hybrid LES/RANS Simulations of Flow over a Square Cylinder

Published

Author(s)

Jianghua Ke, DongHun Yeo

Abstract

Unsteady RANS (URANS) and Hybrid LES/RANS (specifically IDDES) simulations were conducted to numerically investigate the velocity field around, and pressures distribution and forces over a square cylinder immersed in a uniform, steady oncoming flow with Reynolds number Re = 21400. The vortex shedding responses in terms of Strouhal number, the pressure distribution, the velocity profile and the velocity fluctuations obtained by numerical simulations are compared with experimental data. Both URANS and IDDES simulations accurately predict the vortex shedding frequency and the velocity field upwind of the wake region. If a spanwise cell spacing is appropriately chosen, the IDDES model also shows very good performance in predicting the wake region flow (in terms of pressure coefficient distribution, streamwise and cross-stream velocity profiles and rms velocity fluctuations), while URANS is less effective in predicting the wake.
Conference Dates
June 7-11, 2016
Conference Location
Boston, MA
Conference Title
8th International Colloquium on Bluff Body Aerodynamics and Applications

Keywords

URANS, Hybrid LES/RANS, IDDES, square cylinder, turbulence modeling

Citation

Ke, J. and Yeo, D. (2016), RANS and Hybrid LES/RANS Simulations of Flow over a Square Cylinder, 8th International Colloquium on Bluff Body Aerodynamics and Applications, Boston, MA (Accessed June 23, 2024)

Issues

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Created June 10, 2016, Updated August 18, 2020