离散化
网格
边界层
湍流
消散
边值问题
同种类的
不变(物理)
机械
流量(数学)
工作(物理)
应用数学
动能
数学
几何学
物理
统计物理学
数学分析
经典力学
热力学
数学物理
作者
Jonathon Sumner,Christian Masson
摘要
SUMMARY The Reynolds‐averaged Navier–Stokes equations/ k − ε approach is the popular and practical choice for carrying out simulations involving the atmospheric boundary layer. However, despite its widespread use, implementation of this approach is not without its challenges—even when considering the simplest case of horizontally homogeneous conditions. Most notably, the distributions of turbulent kinetic energy and its dissipation rate have proved difficult to maintain near solid boundaries, particularly in wind engineering applications where the near‐wall grid is relatively coarse. In this work, the origin of these errors is investigated, and it is shown that by applying appropriate discretization schemes in conjunction with the Richards and Hoxey boundary conditions, truly invariant profiles of all flow properties can be obtained on such grids. Furthermore, with this finding, a wall treatment for coarse grids is proposed that could be implemented for non‐homogeneous conditions. All simulations are carried out using OpenFOAM‐1.6.x. Copyright © 2011 John Wiley & Sons, Ltd.
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