In order to investigate the mechanism of cross ventilation with open windows, velocity and pressure fields of airflows in and around building models are analyzed in detail by means of wind tunnel tests and numerical simulations. Large eddy simulation (LES) is used for 3D turbulent flow analysis. The results of LES agree very well with those of the wind tunnel tests, and thus the accuracy of the numerical method used here is well validated. By means of LES, the spatial distributions of mean static pressure, turbulence energy, turbulence energy dissipation rate, etc. are examined with sufficient accuracy. The energy dissipating process (total pressure loss) along a cross flow through a building model is examined in relation to the conventional method for predicting the airflow rate of wind-induced ventilation, which uses static pressure drops and the discharge coefficients α of openings. However, in cross ventilation with large openings, the dynamic pressure which has a significantly large value in a room, cannot be neglected. Therefore we cannot predict the airflow rates with the conventional method based on static pressure drops. The airflow through large openings still preserves much of its mean kinetic energy when it remains inside the room and this is reflected in decreased values of the total pressure loss coefficients.
|Number of pages||12|
|Journal||Journal of Wind Engineering and Industrial Aerodynamics|
|Publication status||Published - 1992 Jan 1|
ASJC Scopus subject areas
- Civil and Structural Engineering
- Renewable Energy, Sustainability and the Environment
- Mechanical Engineering