STREAM TUBE ANALYSIS OF CROSS-VENTILATED SIMPLE-SHAPED MODEL AND DETACHED HOUSE

Conventional method to predict ventilation rate induced by wind is based on the orifice equationassociated with the discharge coefficient and wind pressure coefficient. In the cross-ventilationphenomena, however, this method has a problem due to the difficulty to predict resistance of thebuilding related with total pressure loss. In this paper, therefore, the stream tube caught by the inletopening is analyzed to investigate the pressure loss due to the transformation (and possiblyconvergence and divergence) of the stream tube. Two types of model, simple-shaped rectangularmodel and detached house model, were analyzed with three cases of porosity by using CFD prediction.Flow fields inside and outside of the model are to be compared between two types of model. Besides,based on the stream tube analysis, cross-sectional area and average pressure inside the stream tubewill be shown and compared between two types of model. For the detached house model, finally, staticpressure inside the stream tube will be compared with that on the floor.