アクティブ・ディンプルを有する球周囲の流れの数値解析(流体工学,流体機械)

概要

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Numerical simulations of flow around a smooth sphere and a sphere with temporally deforming dimples (active dimples) in critical Reynolds number regime, have been conducted in order to investigate the influence of deformation of active dimples on surrounding boundary layer. It is observed that the drag coefficient is decreased when the Reynolds number is greater than Re>10^5 by the transition of the boundary layer for the smooth sphere, as is reported by many experiments in the literature. It is shown the drag coefficient is decreased up to 40% when appropriate dimple scales and period of deformation are given. The active dimple promotes transition of boundary layer in the vicinity of the sphere, and restraints the detachment of flow. It is expected the applicability of active dimples displayed to a flow control device which is attached the surface of transportation body such as an airplane, a ship and so on.
一般社団法人日本機械学会の論文
2006-12-25