Wind-Driven Rain Load on Building Enclosures - Towards the Reliable Prediction of Absorption and Evaporation (original) (raw)

Abstract

In numerical simulations of the heat, air and moisture response of building enclosures, wind-driven rain (WDR) is commonly assumed to be equally distributed over the material surface and implemented as a constant flux during a certain period. In reality, WDR is a discrete phenome- non, with individual rain drops hitting the building facade. In this paper the WDR load and the valid- ity of the spatially averaging model are investigated both experimentally and numerically. For the experimental study, a new set-up has been developed, which is able to measure the evolution in time of WDR load, absorption, evaporation and runoff at the material surface. In the numerical part the classical one-dimensional averaging approach is compared with a three-dimensional discrete ap- proach. This allows to verify the accuracy of the current numerical simulation that deals with wind- driven rain as a boundary condition.

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