Applied Mathematics and Mechanics (English Edition) ›› 2020, Vol. 41 ›› Issue (1): 33-50.doi: https://doi.org/10.1007/s10483-020-2559-7

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

Shengjun FENG1, Xiaojing ZHENG2, Ruifeng HU1, Ping WANG1   

  1. 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
  • Received:2019-05-04 Revised:2019-08-17 Published:2019-12-14
  • Contact: Ping WANG E-mail:wping@lzu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (No. 11490551) and the Fundamental Research Funds for the Central Universities (Nos. lzujbky-2016-k13 and lzujbky-2018-k07)

Abstract: 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.

Key words: atmospheric boundary layer, near-wall correction, large-eddy simulation (LES), very-large-scale motion

2010 MSC Number: 

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