数值模拟大气边界层中解决壁面函数问题的方法研究

方平治;顾 明;谈建国;韩志惠

振动与冲击 ›› 2015, Vol. 34 ›› Issue (2) : 85-90.

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PDF(1687 KB)
振动与冲击 ›› 2015, Vol. 34 ›› Issue (2) : 85-90.
论文

数值模拟大气边界层中解决壁面函数问题的方法研究

  • 方平治1,顾 明2 ,谈建国3,韩志惠3
作者信息 +

A method to solve the wall function problem in simulating the atmospheric boundary layer

  • FANG Ping-zhi1,GU Ming2,TAN Jian-guo3,HAN Zhi-hui3
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摘要

针对在雷诺平均N-S方程湍流模型框架内壁面函数用于模型化壁面附近的低雷诺数流动问题,探讨基于标准 湍流模型数值模拟大气边界层中出现的壁面函数。在已有标准壁面函数基础上,通过增加一个附加项模型化地面建筑结构等粗糙元因大小不一、错乱分布对地表附近空气流动产生的附加影响。通过模拟缩尺比为1:300的具有较大空气动力学粗糙长度的中性大气边界层、缩尺比为1:50的TTU低矮建筑模型在中性大气边界层内的绕流,对附加项的有效性及使用场合进行评估、说明。结果表明,附加项对解决壁面函数问题,即在计算域内保持来流边界条件是必要的。

Abstract

Wall function is preferred to model the low Reynolds-number flow near wall based on the Reynolds-averaged Navier-Stokes turbulent models. Wall function problem in simulating the atmospheric boundary layer based on the standard turbulent model was investigated in this paper. An extra term which considers the extra effects induced by non-uniform and irregular distribution of roughness elements such as various structures on the land surface was proposed and appended to the widely accepted standard wall function. The effectiveness and application situation of the proposed term was firstly demonstrated by simulating a neutral wind field with the scale of 1:300 featured by larger aerodynamic roughness length. The flow around the TTU model in a neutral wind field with the scale of 1:50 was then simulated. The extra term is shown to be necessary to solve the wall function problem by preserving the inlet flow boundary conditions in both cases.

 

关键词

大气边界层 / 标准壁面函数 / 壁面函数问题 / 物理粗糙高度 / 空气动力学粗糙长度

Key words

atmospheric boundary layer / standard wall function / wall function problem / physical roughness height / aerodynamic roughness length

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导出引用
方平治;顾 明;谈建国;韩志惠. 数值模拟大气边界层中解决壁面函数问题的方法研究[J]. 振动与冲击, 2015, 34(2): 85-90
FANG Ping-zhi;GU Ming;TAN Jian-guo;HAN Zhi-hui. A method to solve the wall function problem in simulating the atmospheric boundary layer[J]. Journal of Vibration and Shock, 2015, 34(2): 85-90

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