WD2 Rain and Snow

Due to rapid changes in climate, it is expected that the exposure of buildings to wind driven rain (WDR) will increase, resulting in extensive damage to building facades.Recently, there has been increased demand for better performance of hygrothermal modelling to assess the moisture behaviour of building components.As part of a project studying moisture impacts on historic buildings, Brodick castle (a 19th century sandstone building) was selected due to its ideal position in an exposed part of the west of Scotland and was monitored for over year.The results have been combined with detailed measurements of the material moisture content and the internal environment.Numerical simulation has been adopted to evaluate wind flow, raindrop trajectories and rain intensities around the castle using the (CFD) package Fluent.Finally, the WDR predicted from the CFD model is used as input boundary conditions for further heat air and moisture (HAM) computer modelling and validation with the experimental results.