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 equation associated with the discharge coefficient and wind pressure coefficient. In the cross-ventilation phenomena, however, this method has a problem due to the difficulty to predict resistance of the building related with total pressure loss. In this paper, therefore, the stream tube caught by the inlet opening is analyzed to investigate the pressure loss due to the transformation (and possibly convergence and divergence) of the stream tube. Two types of model, simple-shaped rectangular model 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 tube will be shown and compared between two types of model. For the detached house model, finally, static pressure inside the stream tube will be compared with that on the floor.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Samhällsbyggnadsteknik -- Husbyggnad (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Civil Engineering -- Building Technologies (hsv//eng)

Nyckelord

CFD

Cross-ventilation

Stream tube

Total pressure

Wind tunnel

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