修正Building-Cube法による非圧縮性流体解析(流体工学,流体機械)

抄録

A Cartesian-mesh approach named Building-Cube Method (BCM) was developed for flow computations. This method has a feature of dividing a computational domain into a number of sub-domains (named as 'Cube') by Quad-tree or Oct-tree, and processing the sub-domains in parallel. In this paper, we propose the modified BCM for changing the subdividing method of the computational domain from Quad-tree to Nona-tree (in two-dimensional case). The purpose of the modification is to subdivide the computational domain more efficient and also to simplify the data exchange method between cubes. The method is evaluated by computing flows around a circular cylinder and an airfoil. It is shown that the modified BCM divides the computational domain more efficiently than the original BCM without degrading the computational accuracy. It is also concluded that the mesh size of about 0.3 Re^<-0.5> near the surface is necessary to reduce the influence of the staircase approximation of surface in the Cartesian-mesh approach.