基于k-e模型的大气边界层数值模拟
首发时间:2018-03-27
摘要:在计算风工程(CWE)中,实现大气边界层(ABL)来流边界条件的自保持是基本前提条件,然而在很多已发表的文献中这一基本要求被忽视或未得到满足。该文首先回顾了已有研究者对该问题的研究进展,基于湍流模型和平衡湍流假设,推导了适用于一般风工程计算的入口来流边界条件表达式,并给出了适用于地形风场计算的风速和湍流剖面。随后通过二维平坦场地数值模拟检验所生成风剖面的自保持特性,效果理想。
关键词: 计算风工程 数值模拟 平衡大气边界层 入流边界条件
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Numerical simulation of atmospheric boundary layer based on k-e model.
Abstract:The self-sustaining equilibrium of inflow boundary conditions for atmosphere boundary layers (ABL)is a precondition for computational wind engineering (CWE). However, this basic requirement has been neglected in many published studies. This paper firstly reviews the published-study of this problem.Subsequently,inflow boundary conditions for general CWE are derived based on the turbulence model and theassumption of equilibrium turbulence. Wind velocity and turbulence profile are proposed for windfield simulation on the scale of topography. A 2-D wind field simulation was conducted with a flat topography, and the wind velocity profile demonstrated a satisfactory level of self-sustaining.
Keywords: Computational wind engineering numerical simulation equilibrium atmosphere boundary layer inflow boundary condition
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