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Simulating wind-driven rain on building facades using Eulerian multiphase with rain phase turbulence model

机译：使用欧拉多相和雨相湍流模型模拟建筑立面上的风雨

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Wind-driven rain (WDR) is responsible for many types of damage to building facades and contributes to storm water management problems in urban environments. Consequently there is significant interest in accurately predicting WDR using computational fluid dynamics (CFD) simulations. In this paper an Eulerian multiphase (EM) method is proposed which includes applying a turbulence model for solving the rain phase equation closure rather than a response coefficient to approximate turbulent behaviour. The simulations are conducted using AVL FIRE (TM) with standard k-epsilon model and are validated against experimental data for two cases. The results produce an error ranging from 5% to 39% in the first case and from 9% to 72% in the second case. The discrepancies are attributed largely to the unsuitability of the standard k-epsilon in predicting the flow accurately as well as the limited number of raindrop phases. While the results are not as accurate as other research has shown, the method described in this paper allows for greater flexibility when working with transient rainfall conditions and gives an alternative to the previously proposed response coefficient for modelling turbulent dispersion. The method is viable for calculating general WDR distribution patterns on a facade and can be improved to offer more accurate results. (C) 2016 Elsevier Ltd. All rights reserved.
机译：风雨（WDR）导致建筑物外墙的多种损坏，并导致城市环境中的雨水管理问题。因此，人们对使用计算流体动力学（CFD）模拟准确预测WDR表现出极大的兴趣。本文提出了一种欧拉多相（EM）方法，该方法包括应用湍流模型来解决降雨相位方程的闭合问题，而不是使用响应系数来近似湍流行为。使用带有标准k-ε模型的AVL FIRE（TM）进行仿真，并针对两种情况的实验数据进行了验证。结果产生的误差在第一种情况下为5％到39％，在第二种情况下为9％到72％。差异主要归因于标准k-ε不能正确预测流量以及雨滴阶段数量有限。尽管结果不如其他研究表明的那样准确，但是本文描述的方法在瞬态降雨条件下工作时具有更大的灵活性，并且可以替代先前提出的用于模拟湍流弥散的响应系数。该方法对于计算立面上的一般WDR分布模式是可行的，并且可以进行改进以提供更准确的结果。 （C）2016 Elsevier Ltd.保留所有权利。

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