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Large eddy simulation of high-Reynolds-number atmospheric boundary layer flow with improved near-wall correction

查看全文 作　　者：Shengjun [1]FENG;Xiaojing [2]ZHENG;Ruifeng [1]HU;Ping [1]WANG 高影响力作者 机构地区：[1]Key Laboratory of Mechanics on Disaster and Environment in Western China,Ministry of Education,College of Civil Engineering and Mechanics,Lanzhou University,Lanzhou 730000,China;[2]Research Center for Applied Mechanics,School of Mechano-Electronic Engineering,Xidian University,Xi’an 710071,China高影响力机构 出　　处：《Applied Mathematics and Mechanics(English Edition)》索引2020年第41卷第1期,共18页高影响力期刊 基　　金：Project supported by the National Natural Science Foundation of China(No.11490551);the Fundamental Research Funds for the Central Universities(Nos.lzujbky-2016-k13 and lzujbky-2018-k07) 摘　　要：It is highly attractive to develop an efficient and flexible large eddy simulation(LES)technique for high-Reynolds-number atmospheric boundary layer(ABL)simulation using the low-order numerical scheme on a relatively coarse grid,that could reproduce the logarithmic profile of the mean velocity and some key features of large-scale coherent structures in the outer layer.In this study,an improved near-wall correction scheme for the vertical gradient of the resolved streamwise velocity in the strain-rate tensor is proposed to calculate the eddy viscosity coefficient in the subgrid-scale(SGS)model.The LES code is realized with a second-order finite-difference scheme,the scale-dependent dynamic SGS stress model,the equilibrium wall stress model,and the proposed correction scheme.Very-high-Reynolds-number ABL flow simulation under the neutral stratification condition is conducted to assess the performance of the method in predicting the mean and fluctuating characteristics of the rough-wall turbulence.It is found that the logarithmic profile of the mean streamwise velocity and some key features of large-scale coherent structures can be reasonably predicted by adopting the proposed correction method and the low-order numerical scheme. 关 键 词：atmospheric boundary layer near-wall correction large-eddy simulation(LES) very-large-scale motion
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