Large eddy simulation of high-Reynolds-number atmospheric boundary layer flow with improved near-wall correction |
| |
Authors: | Shengjun FENG Xiaojing ZHENG Ruifeng HU Ping WANG |
| |
Institution: | 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 |
| |
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. |
| |
Keywords: | atmospheric boundary layer near-wall correction large-eddy simulation(LES) very-large-scale motion |
本文献已被 CNKI 维普 等数据库收录! |
| 点击此处可从《应用数学和力学(英文版)》浏览原始摘要信息 |
| 点击此处可从《应用数学和力学(英文版)》下载免费的PDF全文 |
|