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The paper presents wind tunnel investigations of the influence of wind direction on the natural ventilation of buildings. Tests were carried out on models of an apartment building complex, made to 1:100 scale, consisting of six adjacent buildings, and on a natural-scale isolated roof ventilation shaft outlet. Walls and roof pressure distribution were obtained and difference in pressure values between windows and the ventilation shaft outlets on the roof have been calculated. It was found that some wind directions decrease chimney draught. Aerodynamic interference of neighbouring buildings also decreases chimney draught. The influence of the location of an adjacent building on the ventilation of the building under consideration was tested.

This paper presents wind tunnel investigations of the aerodynamic interference effects on the pressure distribution on a building adjacent to another one. Tests were carried out at the Aviation Institute in Warsaw. Models, made to 1:100 scale, were set up behind a turbulent flow development system. It has been found that for some wind directions local values of the external pressure coefficient on the leeward wall, close to the gap between buildings, may be 2.5 times higher than on an isolated building. This may also lead to a reverse draught in the natural ventilation system of the apartment buildings.