立方体周辺気流のLES解析における数値振動抑制手法の研究 : 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2

抄録

In the previous paper, the formulation of the 3-D CFD code with the staggered grid system based on generalized curvilinear coordinates was developed and tested for LES of channel flow. This paper investigates a numerical method for interpolation of variables at discrete points and geometrical definitions of control volumes of the pressure based on the staggered end system. There are two types of definition of the control volumes of the pressure. First type defines that the pressure definition points may not be located at the centers of the control volumes and boundary surfaces of them are located at the midpoints between two adjacent pressure definition points. Second type defines that the pressure definition points are located at the centers of the control volumes and boundary surfaces of them may not be located at the midpoints between two adjacent pressure definition points. Four types of discrete scheme are composed and investigated by applying them to LES of flow around a cube. A scheme based on the first type definition of the control volumes is recommended by reason that the generation of wiggle is reduced to a very weak level and agreement of the pressure distributions with the experimental data is confirmed to be good, as well as those of the turbulence kinetic energy.