E244 非構造格子法を用いたゴルフボールまわりの流れ計算

概要

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Flow around a golf ball is numerically simulated using an unstructured grid method. The golf ball surface with 480 dimples is defined by CATIA-CAD software. Then the surface is triangulated using the advancing front method that faithfully keeps the edges of the surface dimples. The computational space is discretized by a hybrid grid where the prismatic cells are used in the wall boundary layers and the tetrahedral cells fill in the remaining region. The compressible Navier-Stokes equations are solved by a finite volume cell-vertex upwind scheme with the Lower-Upper Symmetric Gauss-Seidel, implicit time-integration method. The computed result shows the essential flow features of the separated flow around the golf ball. The computed drag coefficients at Reynolds number of 2x(10)^5 is very close to the experimental result that is 40% lower than that of the sphere with smooth surface.
2000-07-25