Appropriate boundary conditions for computational wind engineering models revisited
Appropriate boundary conditions for computational wind engineering models revisited
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DOI：
10.1016/j.jweia.2010.12.008
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发表时间：
2011-04-01
影响因子：
4.8
通讯作者：
Norris, S. E.
中科院分区：
文献类型：
--
作者：
Richards, P. J.;Norris, S. E.
在1992年的第一届计算风工程会议上，提出了“使用κ-ε湍流模型的计算风工程模型的适当边界条件”。在本文中，它表明，这些条件可以直接推导出治疗的发病流作为一个水平均匀的湍流表面层，与流动被驱动的顶部边界处的剪切应力。这种方法被扩展，以提供适合于使用标准kappa-kind来模拟流动的入口剖面和边界条件，RNG kappa-omega、Wilcox kappa-omega和LRR QI湍流模型。给出了它们在商业CFD代码CFX 12.0中的应用方法。结果表明，在流动中的各种湍流模型常数设置的有效值的冯卡门常数，这并略有不同的模型之间。讨论了标准湍流模式常数所确定的湍流度与大气中观测到的湍流度之间的差异。讨论了地面附近产生过多湍流和过高预测滞止压力的问题，并提出了可能的解决方案。(C)2011爱思唯尔有限公司保留所有权利。
At the first Computational Wind Engineering conference in 1992 "Appropriate boundary conditions for computational wind engineering models using the kappa-epsilon turbulence model" were proposed. In this paper it is shown that these conditions can be directly derived by treating the onset flow as a horizontally homogeneous turbulent surface layer, with the flow being driven by a shear stress at the top boundary. This approach is extended to provide the inlet profiles and boundary conditions appropriate for modelling the flow using the standard kappa-epsilon., RNG kappa-epsilon, Wilcox kappa-omega and LRR QI turbulence models. Means for their application within the commercial CFD code CFX 12.0 are given. It is shown that within the flow the various turbulence model constants set the effective value of von Karman's constant, which does vary slightly between models. The discrepancy between the turbulence level set by the standard turbulence model constants and that observed in the atmosphere is discussed. Problems with excessive turbulence generation near the ground and the over-prediction of stagnation pressures are discussed and possible solutions proposed. (C) 2011 Elsevier Ltd. All rights reserved.