An improved interpolation method for hybrid overset grid and its application

For overset grid, reasonable interpolation between grids is one of the bases to ensure correct calculation of flow fields. In this paper, a new interpolation method for hybrid overset grid is presented, which focuses on the elimination of interpolation error coming from the grids mismatch at the intergrid boundary. With the combination of second order accuracy interpolation and proper selection and expansion of interpolation template by grid size, the interpolating accuracy of the cases with poor overset grids matching is improved. The presented method is suitable for arbitrary polyhedral grid and easy to be implemented. Compared with original method, numerical tests show that the presented method interpolates flow field variables with less dissipation when bad grids matching happened at the intergrid boundary, the variable contour at the intergrid boundary is smoother, and computational results agree more with the experimental data.