Even if there is only one opening within a room and there is no temperature difference between the inside and outside, the room will be ventilated by the external natural wind. Two kinds of theoretical approach have been tried before to evaluate the mechanisms driving this flow: one is pulsation theory and the other is mixing layer theory. In this paper, these theories are reviewed and the validity of each is examined by means of a wind tunnel test. Results showed that the pulsation theory was not applicable to all wind directions. An experimental equation was derived from wind tunnel tests on a small building model incorporating a single circular opening. In addition, other approaches using CFD and PIV to determine the airflow inside the single opening precisely were tried and the dominant frequency of the velocity fluctuation was examined.
In erder to examine the yalidity of mixing layer theory for predicting the airflow rate through a single opening subjected te external wind now , wind tunnehest was conducted . The existence efexpanCling mixing layer were confirrned and the accuracy ofequation to calculate the aidiow rate frorn the velocity and cencentration distribution at the leeward of an opening were investigated . Final 璽 y, the simple equatiQn to dec 童 de the position ofthe outeredge ofmixing 訌 ayer and the equation to calculate lhe air now rate were presented .
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