Constrained large-eddy simulation of turbulent flow over inhomogeneous rough surfaces

Zhang，Wen1; Wan，Minping1,2; Xia，Zhenhua3; Wang，Jianchun1,2; Lu，Xiyun4; Chen，Shiyi1,2

2021

10.1016/j.taml.2021.100229

Theoretical and Applied Mechanics Letters   影响因子和分区

2095-0349

In this work we extend the method of the constrained large-eddy simulation (CLES) to simulate the turbulent flow over inhomogeneous rough walls. In the original concept of CLES, the subgrid-scale (SGS) stress is constrained so that the mean part and the fluctuation part of the SGS stress can be modelled separately to improve the accuracy of the simulation result. Here in the simulation of the rough-wall flows, we propose to interpret the extra stress terms in the CLES formulation as the roughness-induced stress so that the roughness inhomogeneity can be incorporated by modifying the formulation of the constrained SGS stress. This is examined with the simulations of the channel flow with the spanwise alternating high/low roughness strips. Then the CLES method is employed to investigate the temporal response of the turbulence to the change of the wall condition from rough to smooth. We demonstrate that the temporal development of the internal boundary layer is just similar to that in a spatial rough-to-smooth transition process, and the spanwise roughness inhomogeneity has little impact on the transition process.

Inhomogeneity Large-eddy simulation Roughness Wall turbulence

英语

第一 ; 通讯

2-s2.0-85102652577

Scopus

1.Guangdong Provincial Key Laboratory of Turbulence Research and Applications,Department of Mechanics and Aerospace Engineering,Southern University of Science and Technology,Shenzhen,518055,China
2.Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou),Guangzhou,511458,China
3.Department of Engineering Mechanics,Zhejiang University,Hangzhou,310027,China
4.Department of Modern Mechanics,University of Science and Technology of China,Hefei,230026,China

Zhang，Wen,Wan，Minping,Xia，Zhenhua,et al. Constrained large-eddy simulation of turbulent flow over inhomogeneous rough surfaces[J]. Theoretical and Applied Mechanics Letters,2021.

Zhang，Wen,Wan，Minping,Xia，Zhenhua,Wang，Jianchun,Lu，Xiyun,&Chen，Shiyi.(2021).Constrained large-eddy simulation of turbulent flow over inhomogeneous rough surfaces.Theoretical and Applied Mechanics Letters.

Zhang，Wen,et al."Constrained large-eddy simulation of turbulent flow over inhomogeneous rough surfaces".Theoretical and Applied Mechanics Letters (2021).