Abstract: Original Cartesian Mesh can improve the efficiency of the simulation of flow field, especially for complex geometry. But since the square mesh forms the original Cartesian mesh and every cell has the same width and length, this method can not simulate special flow field with anisotropic properties efficiently and with full adaptivity. In this paper, an adaptive octree anisotropic Cartesian mesh approach is presented to simulate the flow field of complex geometry. In this Cartesian mesh method, a way to determine intersection between cell and surface is provided. For some special cases, this kind of anisotropic grid can be applied to reduce the amount of computational work. To simulate the flow field, a generalized Euler solver with Jameson's finite volume scheme is used. Application of this Cartesian mesh method to simulate the flow field about M6 wing was performed. Results show that the computation can well agree with the experimental data and this method can produce better efforts and cost less time.

Key words: octr ee st ructure, anisotr opic, finite volume, Euler equat ions, CFD