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Large Eddy Simulation of Turbulent Channel Flow with 3D Roughness Using a Roughness Element Model
作者姓名:杨帆  张会强  陈昌麒  王希麟
作者单位:[1]Department of Engineering Mechanics, Tsinghua University, Beijing 100084 [2]Department of Applied Mathematics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong
基金项目:Supported by the National Natural Science Foundation of China under Grant No 50576046, and the AMSS-PolyU Joint Research Institute for Engineering and Management Mathematics of The Hong Kong Polytechnic University under Grant No 1-BA05.
摘    要:Large eddy simulation of turbulent channel flow with dense and small 3D roughness elements is carried out using a roughness element model Profiles of mean Reynolds stress, mean velocity and rms velocity as well as turbulent structures near the wall are obtained. The shear stress in the rough wall is larger than that in the smooth wall side and the rough wall has a larger influence on the channel flow. Profiles of mean streamwise velocity near the wall have logarithmic velocity distributions for both smooth and roughness walls, while there is a velocity decrease for the rough wall due to larger fractional drag. All the three components of rms velocities in the rough wall region are larger than that in the smooth wall region, and the roughness elements on the wall increase turbulent intensity in all directions. The s~reak spacing and average diameter of near wall quasi-s~reamwise vortices increase with the presence of roughness elements on the wall and it is shown that the rough wall induces complex and strong streamwise vortices. Results of dense and small 3D roughness elements in both turbulent statistics and structure, obtained with a relatively simple method, are found to be comparable to related experiments.

关 键 词:大涡模拟  流体力学  湍流  管道流  粗糙元模型
收稿时间:2007-08-20

Large Eddy Simulation of Turbulent Channel Flow with 3D Roughness Using a Roughness Element Model
YANG Fan,ZHANG Hui-Qiang,CHAN Cheong-Ki,WANG Xi-Lin.Large Eddy Simulation of Turbulent Channel Flow with 3D Roughness Using a Roughness Element Model[J].Chinese Physics Letters,2008,25(1):191-194.
Authors:YANG Fan  ZHANG Hui-Qiang  CHAN Cheong-Ki  WANG Xi-Lin
Institution:Department of Engineering Mechanics, Tsinghua University, Beijing 100084Department of Applied Mathematics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong
Abstract:Large eddy simulation of turbulent channel flow with dense and small 3D roughness elements is carried out using a roughness element model Profiles of mean Reynolds stress, mean velocity and rms velocity as well as turbulent structures near the wall are obtained. The shear stress in the rough wall is larger than that in the smooth wall side and the rough wall has a larger influence on the channel flow. Profiles of mean streamwise velocity near the wall have logarithmic velocity distributions for both smooth and roughness walls, while there is a velocity decrease for the rough wall due to larger fractional drag. All the three components of rms velocities in the rough wall region are larger than that in the smooth wall region, and the roughness elements on the wall increase turbulent intensity in all directions. The s~reak spacing and average diameter of near wall quasi-s~reamwise vortices increase with the presence of roughness elements on the wall and it is shown that the rough wall induces complex and strong streamwise vortices. Results of dense and small 3D roughness elements in both turbulent statistics and structure, obtained with a relatively simple method, are found to be comparable to related experiments.
Keywords:47  27  Ep  47  27  Nd  47  27  -e
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