基于标准k-ε模型的平衡大气边界层模拟

基于标准k-ε模型和FLUENT软件,采用适当的平均风和湍流特征量入口条件,同时在壁面处采用修正壁面函数边界条件,进行空流场的平衡大气边界层模拟.将流场中不同位置处的平均风廓线、湍动能及其粘性耗散等流动特征量的廓线进行对比.结果表明,采用标准k-ε模型结合修正壁面函数对气流流经粗糙度相同的壁面时,不同位置处流动特征量的廓线吻合程度均较高.研究提出对建筑绕流等问题模拟之前需进行空流场的平衡性进行分析,另对文中尚未解决的问题进行讨论并提出解决思路.

Application of standard k-ε model to simulate the equilibrium ABL

The standard k-ε model and the general package FLUENT were adopted as a basic platform. With setting invariably appropriate profiles of mean wind velocity and turbulence quantities at inlet, the additional modifications to the standard wall function are applied to wall boundary of the empty fetch. The results show the fairly well CFD simulation comparison of the flow quantities profiles with several different positions of the whole flow domain. The analyses concluded that the modeling of equilibrium boundary layer was the foreshadowing for numerical simulation of flows around building structures. And the problems still unsolved are also discussed and suggestions to mitigate that are given.