Abstract
For a building model with rectangular plan and a pair of openings in diagonal positions, three-dimensional indoor airflow was measured at 980 points for every 15 degree wind angles between 0° and 165°. On the basis of the measurement result, the characteristics of the indoor airflow was analyzed Rough overview on the main stream region tends to make the observer misunderstand that such main stream region was connecting smoothly without any striking at obstacles between inlet and outlet openings. However, air stream basically goes straight, strikes against obstacles on its direction, rebounds and changes own direction as a result. This process is repeated until the main stream finds the outlet opening. When the main stream strikes the obstacles like walls at a large angle, so called "escape flow" is formed in either above and below the main stream. The escape flow escapes from the area where the main stream strikes the obstacles. When the main stream strikes the obstacle at a small angle, it goes along the obstacle due to the Coanda effect. If there is enough space beside the main stream region, the circular flow can be formed beside the main stream. The existence of the main stream and the circular flow contributes to determine the distribution of thermal environment in cross-ventilated indoor space. It is necessary to collect continuously the information on the airflow in the space with different layouts of openings and any partitions.
