Paper 17: Volume 5 No.1 June 2006 Edition
Natural,
Wind-Forced Ventilation caused by Turbulence
in a Room with a Single Opening
Toshio
Yamanaka1, Hisashi Kotani1, Kiyotaka Iwamoto2
and Masahiro Kato3
1Department
of Architectural Engineering, Graduate
School
of
Eng.
,
Osaka University
,
Japan
2Takenaka
Research and Development Institute, Takenaka Corporation, Japan
3Kajima
Technical Research Institute, Kajima Corporation,
Japan
Abstract
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.
Key words: single
opening, wind-forced ventilation, pulsation, mixing layer, CFD, PIV.
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