Large-Eddy Simulation of smooth and rough channel flows using a one-dimensional stochastic wall model
Large-Eddy Simulation of smooth and rough channel flows using a one-dimensional stochastic wall model
复制标题
使用一维随机壁模型对光滑和粗糙河道流进行大涡模拟
DOI:
10.1016/j.compfluid.2021.105135
复制
发表时间:
2021
影响因子:
2.8
通讯作者:
Chamecki, Marcelo
中科院分区:
文献类型:
--
作者:
Freire, Livia S.;Chamecki, Marcelo
In this study a stochastic wall model based on the “large-eddy” version of the One-Dimensional Turbulence (ODT) model was developed for Large-Eddy Simulation (LES) of smooth and rough channel flows, with the primary goal of providing a refined turbulent flow field near the wall. This LES-ODT coupling was tested with the dynamic Smagorinsky and the scale-dependent Lagrangian dynamic subgrid-scale models. When compared to the same LES with a wall model based on a local law-of-the-wall, LES-ODT improved the one-dimensional energy spectra for all three velocity components close to the wall for both subgrid-scale models tested. More importantly, improving the LES wall model had a more positive effect in the near-wall spectra than improving the subgrid-scale model from the traditional dynamic to the scale-dependent Lagrangian dynamic model. For smooth channels, LES-ODT results compared well with DNS of R e λ= 590 and 5200; however, the variance modeled by the ODT presents discrepancies for all three velocity components, an issue inherent to ODT. Finally, the simulation of a channel flow with additional roughness modeled by a drag force was compared to data of atmospheric flow through a maize field, providing evidence of the potential for this approach to directly simulate complex near-wall phenomena. Given its high computational cost, the main use of the LES-ODT coupling is in studies that require a refinement of the near-wall region without the need to refine the entire LES domain.
登录
查看更多内容
影响因子:
4.3
作者:
Freire, L. S.;Chamecki, M.;Gillies, J. A.
通讯作者:
Gillies, J. A.
DOI:
--
发表时间:
2003
期刊:
影响因子:
--
作者:
R. Schmidt;A. Kerstein;S. Wunsch;Vebjorn Nilsen
通讯作者:
Vebjorn Nilsen
影响因子:
3.7
作者:
A. Kerstein;W. Ashurst;S. Wunsch;Vebjorn Nilsen
通讯作者:
Vebjorn Nilsen
DOI:
10.1063/1.857955
发表时间:
1991-07-01
期刊:
PHYSICS OF FLUIDS A-FLUID DYNAMICS
影响因子:
--
作者:
GERMANO, M;PIOMELLI, U;CABOT, WH
通讯作者:
CABOT, WH
DOI:
--
发表时间:
2017
期刊:
影响因子:
--
作者:
M. Klein;H. Schmidt
通讯作者:
H. Schmidt