数値解析法の定式化とLESによるチャンネル流解析 : 一般曲線座標系・スタガードグリッドによる気流数値解析法その1

概要

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A 3-D CFD code with staggered grid system based on generalized curvilinear coordinates has been developed in order to put an analysis method of turbulent flow to practical use. Two cases of validation have been carried out by LES of channel flow using orthogonal and nonorthogonal ( skew ) grids. First case uses an orthogonal grid and second case uses a skew grid. Mean-velocity profiles of two cases show almost the same distribution as that of the logarithmic law. However, the profile based on the skew grid in second case shows an asymmetrical distribution with about 3% difference between upper side values and lower ones. Fluctuation velocity components and Reynolds shear stress in the first and second cases correspond very closely each other. It is confirmed that the use of such a slightly skew grid does not have severe influences on the behavior of calculated turbulence.
社団法人日本建築学会の論文
1997-06-30