Fluid-Solid Coupling Surface Detail Optimization Algorithm Based on Material Point Method

In order to enhance the surface details of the existing material point method in fluid-solid coupling, and improve the problem that a large number of solid particles have no contribution on its surface remeshing, the paper proposes an efficient fluid-solid coupling adaptive material point method. First, an interface quadrature method is used to solve the problem of viscous numerical artifact in the material point method, and realize the free-slip effect on the moving contact interface of the fluid and solid. Then, an adaptive generalized interpolation method is introduced to adjust the grid resolution in different areas of fluid and solid to enhance surface details. Finally, the narrow band affine particle in cell method is adopted to reduce the number of particles inside the solid with the particle resampling method, thereby saving memory space and reducing the amount of calculation. The paper makes several experiments with Stanford open source models. Compared with the uniform background grid material point method, experiments show that the proposed method has more abundant details in the surface of fluid and solid, the overall particle number is reduced by 80%, and the average simulation efficiency is improved by 50% in the ablation experiment scene.