602 Incompressible Flow Computations by Modified Building-Cube Method
Masatoshi Watanabe, Kazuhiro Nakahashi · The Proceedings of Ibaraki District Conference · 2009
A Cartesian-mesh approach, named 'Building-Cube Method (BCM)' was developed for flow computations. This Method has a feature of dividing the computational domain into a number of sub-domains (we named sub-domain as 'Cube') by Quad-tree or Cct-tree, and processing the sub-domain in parallel. In this paper, we propose the modified BCM for changing the method of dividing the computational domain from Quad-tree to Nona-tree (in two-dimensional case). The purpose of the modification is to subdivide the computational domain highly efficient. At first, the data exchange method between Cubes was examined, then flow computation around a circular cylinder and a airfoil were executed. As a result, the Modified BCM divides the computational domain more efficiently than the original BCM without degrading the computational accuracy. It is also concluded that division of the surface by the size of about 0.3Re^ is necessary to reduce the influence of the shape approximation.