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Wind and Structures
  Volume 5, Number 5, September 2002 , pages 441-462

Spatial and temporal distribution of driving rain on a low-rise building
Bert Blocken and Jan Carmeliet

    This paper presents a practical numerical method to determine both the spatial and temporal distribution of driving rain on buildings. It is based on an existing numerical simulation technique and uses the building geometry and climatic data at the building site as input. The method is applied to determine the 3D spatial and temporal distribution of wind-driven rain on the facade a low-rise building ofrncomplex geometry. Distinct wetting patterns are found. The important causes giving rise to these particular patterns are identified : (1) sweeping of raindrops towards vertical building edges, (2) sweeping of raindrops towards top edges, (3) shelter effect by various roof overhang configurations. The comparison of thernnumerical results with full-scale measurements in both space and time for a number of on site recorded rain events shows the numerical method to yield accurate results.
Key Words
    driving rain; wind-driven rain; building; CFD; numerical simulation; experimental verification.
Department of Civil Engineering, Laboratory of Building Physics, Katholieke Universiteit Leuven, Kasteelpark Arenberg 51, 3001 Leuven, Belgium

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