RANS and hybrid LES/RANS simulations of flow over a square cylinder
Abstract Unsteady RANS (URANS), hybrid LES/RANS and 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 = 21,400. The vortex shedding re...
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Online Access: | http://link.springer.com/article/10.1186/s42774-019-0012-9 |
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doaj-85b44f68058c4c42b274d4f2c7d3939c2020-11-25T02:10:35ZengSpringerOpenAdvances in Aerodynamics2524-69922019-05-011112410.1186/s42774-019-0012-9RANS and hybrid LES/RANS simulations of flow over a square cylinderJianghua Ke0National Institute of Standards and TechnologyAbstract Unsteady RANS (URANS), hybrid LES/RANS and 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 = 21,400. 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. Compared with 2D URANS simulation, 3D simulations using hybrid LES/RANS and IDDES models provide more accurate prediction on the responses in the wake, including mean streamwise velocity profile and rms velocity fluctuations. This also results in more accurate prediction of time-averaged surface pressure coefficient on the rear surface obtained by 3D hybrid LES/RANS and IDDES simulations than by URANS simulation. When a hybrid LES/RANS model or IDDES model is used, a more accurate prediction for either pressure coefficient or velocity profile (especially in the far wake region) is not guaranteed by increasing the mesh resolution along the spanwise direction of the square cylinder.http://link.springer.com/article/10.1186/s42774-019-0012-9URANSHybrid LES/RANSIDDESSquare cylinderTurbulence modeling |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Jianghua Ke |
spellingShingle |
Jianghua Ke RANS and hybrid LES/RANS simulations of flow over a square cylinder Advances in Aerodynamics URANS Hybrid LES/RANS IDDES Square cylinder Turbulence modeling |
author_facet |
Jianghua Ke |
author_sort |
Jianghua Ke |
title |
RANS and hybrid LES/RANS simulations of flow over a square cylinder |
title_short |
RANS and hybrid LES/RANS simulations of flow over a square cylinder |
title_full |
RANS and hybrid LES/RANS simulations of flow over a square cylinder |
title_fullStr |
RANS and hybrid LES/RANS simulations of flow over a square cylinder |
title_full_unstemmed |
RANS and hybrid LES/RANS simulations of flow over a square cylinder |
title_sort |
rans and hybrid les/rans simulations of flow over a square cylinder |
publisher |
SpringerOpen |
series |
Advances in Aerodynamics |
issn |
2524-6992 |
publishDate |
2019-05-01 |
description |
Abstract Unsteady RANS (URANS), hybrid LES/RANS and 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 = 21,400. 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. Compared with 2D URANS simulation, 3D simulations using hybrid LES/RANS and IDDES models provide more accurate prediction on the responses in the wake, including mean streamwise velocity profile and rms velocity fluctuations. This also results in more accurate prediction of time-averaged surface pressure coefficient on the rear surface obtained by 3D hybrid LES/RANS and IDDES simulations than by URANS simulation. When a hybrid LES/RANS model or IDDES model is used, a more accurate prediction for either pressure coefficient or velocity profile (especially in the far wake region) is not guaranteed by increasing the mesh resolution along the spanwise direction of the square cylinder. |
topic |
URANS Hybrid LES/RANS IDDES Square cylinder Turbulence modeling |
url |
http://link.springer.com/article/10.1186/s42774-019-0012-9 |
work_keys_str_mv |
AT jianghuake ransandhybridlesranssimulationsofflowoverasquarecylinder |
_version_ |
1724918801058758656 |