Co-host: The Institute of Electrical Engineering of Japan, Japanese Society of Steel Construction, Japan Society of Civil Engineers, Meteorlological Society of Japan, Architectural Institute of Japan, Japan Association for Wind Engineering
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A wind tunnel experiment was conducted to investigate the effects of unstable stratification on cavity flow behind a cubical building. Mean and fluctuation velocities were measured by both laser Doppler anemometry and particle image velocimetry in the thermally stratified wind tunnel. Although both mean and fluctuation velocity components showed similar profiles in the near wake of the building under neutral and unstable conditions, turbulent intensities showed higher values in the far wake in unstable stratified flow owing to strong vertical mixing. In particular, as the unstable stratification became stronger, the circular vortex behind the trailing edge of the building tended not to be formed because separation vortices shed from the roof were greatly disturbed by buoyancy.
