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The study of wind driven rain is an important design consideration in the built environment. Numerical prediction of this phenomenon requires knowledge of wind speed, rain drop sizes and rain fall intensity among others. The wind speed and rain drop sizes are usually calculated from field measurements. Rainfall intensity is usually assumed to follow a generalized Pareto distribution. Studies have indicated that the rain drop sizes are a function of the rainfall intensity. From a design optimization perspective, it is unclear what value of rainfall intensity should be considered in the process. This paper seeks to examine that in detail. Rain over a simplified building is chosen as the representative test case. The results suggest that it is the lower rainfall intensities that are more critical to be considered in the design process. A combination of using both the median as well as the mean rainfall intensities is proposed for the same.

Determination of Optimal Parameters for Wind Driven Rain CFD Simulation for Building Design in the Tropics