静止および回転時の透過性円柱の後流構造(<小特集>マルチフィジックスCFD/EFDの最前線)

概要

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Wake structure of permeable object is one of great concerns for wind engineering, chemical processing, and fluid machineries. It produces the drag greater than the same-sized solid object due to friction dominant nature even at Reynolds numbers higher than 10^3. In order to characterize the wake structure in such a condition, we measure the flow field around the permeable cylinder made of wire mesh and annularly arrayed thin cylinders. The parametric study presents a spatially delayed amplification of turbulence due to vortex shedding in two frequencies compound in the wake. We also measure the flow for a rotating permeable cylinder to find the interaction between circulating elements and macroscopic behavior of flow. The result indicates a curtain effect of the elements to expand the momentum loss region behind the rotating cylinder.
2010-05-25