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| Abstract |
The results of many wind tunnel model experiments show that the wind pressures on building walls become smaller when building coverage ratio becomes larger. Cross-ventilation rate which is caused by n...atural wind is not easily calculated by the ordinary equation for ventilation rate based on wind pressure coefficients on building walls and pressure drop coefficients of openings, because the air flow through inlets, rooms and outlets conserves a part of its dynamic energy. Numerical simulation of cross-ventilation can give the detailed information of air flow in and around a house and the cross-ventilation rate. Acyclic boundary conditions method for the numerical simulation is used to model the unlimited spread of a built-up area with regularly aligned blocks which are cubic and have two relatively large openings on opposite walls respectively. There are six layouts of blocks with different building coverage one another. An equation for the calculation of the pressure difference between the windward and the leeward boundary is proposed. The cyclic boundary conditions produced stable calculation results. The simulation results of cross-ventilation rate is compared with the ordinary equation.show more
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