Natural, Wind-Forced Ventilation caused by Turbulence in a Room with a Single Opening

Even if there is only one opening within a room and there is no temperature difference between the inside outside, the room will be ventilated by the external natural wind. Two kinds of theoretical approach have 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 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.