Host: Japan Association for Wind Engineering
Pages 131-132
In turbulence flow, the correlation of surface pressure and gust response factor along span-wise direction near the leading edge of a rectangular prism is higher than the correlation of them in approaching flow. It is advocated that this increase in the correlation is affected by vortex shedding or two-dimensional flow structure of separation bubble. In this study, the flow structure around the rectangular prism with chord/depth ratio of 8.0 which is the cross section of flow completely reattachment type in smooth flow and turbulence flow are visualized and captured by PIV (Particle Image Velocimetry) analysis. The flow fields are decomposed by DMD (Dynamic Mode Decomposition) thus discussed the structure of flow including separating shear layer and the mechanism of increase in the correlation along span-wise direction. The results imply the nonuniformity of the momentary reattachment point along span-wise direction in turbulence flow and the characteristic flow derived from the structure of separation bubble contribute to the increase of span-wise correlation.
