Abstract: A multi-layer hybrid grid method is constructed to simulate complex flow field around 2-D and 3-D configuration.The method combines Cartesian grids with structured grids and triangular meshes to provide great flexibility in discretizing a domain.It generates the body-fitted structured grids near the wall surface and the Cartesian grids for the far field.In addition,the triangular meshes are regarded as an adhesive to link each part of grids.The grid combination methodology is discussed,which can smooth hybrid grids and improve the quality of the grids.A uniform type of data is defined to manage and arrange grid data.Using the centered finite volume method,the inviscid and viscous flow allows computation by solving the Euler and Navier-Stokes equations.The computational results prove that grid generation and flow calculation are correct and feasible.

Key words: Cartesian grid, Navier-Stokes equations, hybrid grid technique, centered finite volume method