A combined CFD-HAM approach for wind-driven rain on building facades

被引:50
作者
Blocken, Bert
Roels, Staf
Carmeliet, Jan
机构
[1] Tech Univ Eindhoven, NL-5600 MB Eindhoven, Netherlands
[2] Katholieke Univ Leuven, Dept Civil Engn, Lab Bldg Phys, B-3001 Louvain, Belgium
关键词
wind-driven rain; driving rain; wind flow; building; absorption; runoff; heat; air; moisture transfer analysis; HAM; computational fluid dynamics; time resolution; data averaging;
D O I
10.1016/j.jweia.2006.12.001
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
Numerical heat-air-moisture (HAM) transfer models are increasingly being used to study the hygrothermal performance and the durability of building facades. One of the most important boundary conditions for HAM simulations is wind-driven rain (WDR). Due to the complexity of WDR, however, the current HAM models generally incorporate it in a very simplified way. Recent research has shown that CFD can provide quite accurate estimates of the spatial and temporal distribution of WDR on building facades. Therefore, in this paper, a combined CFD-HAM approach is presented. It consists of implementing catch-ratio charts resulting from CFD simulations into the HAM model. Within the model, these charts are used to convert the standard meteorological input data (wind speed, wind direction and horizontal rainfall intensity) into WDR distribution records that are used as boundary condition for the actual HAM simulations. The combined approach is demonstrated for a simplified wall model. It is shown that the accuracy of the HAM-simulation results is to a large extent determined by the time resolution of the meteorological input data and by the data-averaging technique used for these data. Some important guidelines for accurate HAM analyses with WDR are provided. (c) 2007 Elsevier Ltd. All rights reserved.
引用
收藏
页码:585 / 607
页数:23
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