关键词: 超网格, 重叠网格, 守恒插值, 插值精度, 并行计算

Abstract: Conservative interpolation of the overset mesh interface is still a challenge for CFD. Based on the supermesh technology and the centre-based finite volume method, a new conservative interpolation method for the hybrid overset mesh is developed. The cell-cut algorithm is used to build the local supermesh in the overset grid interface, and the mesh intersection method is employed to expand the number of donor cells reasonably. Then, a conservative interpolation method which applies implicit parallel algorithm is built, which is suitable for arbitrary polyhedral grids. Flow field variables can be interpolated conservatively in overset meshes with second-order accuracy via the local supermesh. Numerical results show that the method proposed is strictly conservative for second-order distributed flow field variables. Compared with the trilinear interpolation method and the reverse distance-weighted interpolation method, the proposed method can reduce the numerical errors, interpolate the variables more accurately, accelerate the convergence process of the residual error, and improve the continuity and smoothness of the flow field contour when the mesh scale matches badly at the interface.

Key words: super mesh, overset mesh, conservative interpolation, interpolation accuracy, parallel computing