21S ゴルフボールの空力係数に対するディンプルの影響(スポーツ工学シンポジウム2001)

概要

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Separation flow around a golf ball is numerically simulated using an unstructured grid method. The compressible Navier-Stokes equations are solved by a finite volume cell-vertex upwind scheme with the Lower-Upper Symmetric Gauss-Seidel time-integration method. The golf ball surface with 432 dimples, which is designed by Sumitomo Rubber Industries Ltd., Japan, is modeled more realistically than our previous research by CATIA-CAD and Edge Editor software. The surface is triangulated using the advancing front method. The computational space are discretized by a hybrid unstructured grid where the prismatic cells are used in the wall boundary layers and the tetrahedral cells fill in the remaining region. The computational result shows the essential features of the separated flow around the ball. The irregular flow separations are observed in golf ball dimples. Computed drag coefficient at at Reynolds number of 2×10^5 is as same as the experimental result and our previous work.
2001-11-07