Towards a strategy to model runoff of wind-driven rain on building facades

Today I gave a seminar at our research group reporting the progress in my phd on runoff of wind-driven rain on porous building materials. The main focus of the presentation was on the experimental work I conducted in 2013 with a little wink to the simulation work I’m doing now with OpenFOAM. The latter however is still a marvellous discovery of the power of OpenFOAM at the moment, but results are expected soon. Below you can find the abstract and presentation of the seminar.

Including runoff results in an increased moisture content of the wall

As wind-driven rain is one of the most important moisture sources for a building envelope, a reliable prediction of the wind-driven rain load is a prerequisite to assess the durability of a building facade. To incorporate wind-driven rain in HAM models (heat, air and moisture), many factors should be taken into account. Not only building geometry, wind speed and wind direction, raindrop size distribution, etc. influence the rain load on buildings, but also phenomena such as raindrop impact, absorption, evaporation and runoff should be taken into account. The following is an excerpt from ‘influence of facade materials on runoff due to wind-driven rain’ by T. Van den Brande et al (2012). A full text is available upon request.