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| ALTERING CONNECTIVITY WITH LARGE DEFORMATION MESH FOR LAGRANGIAN METHOD AND ITS APPLICATION IN MULTIPLE MATERIAL SIMULATION |
| Ruili Wang,Xiao Liang,Zhong Lin |
| (Institute of Applied Physics and Computational Math., Beijing 100094, PR China; College of Math. and Information Science, Shandong University of Science and Technology, Shandong 266590, PR China) |
| DOI： |
| Abstract: |
| A new approach for treating the mesh with Lagrangian scheme of finite volume method is presented. It has been proved that classical Lagrangian method is difficult to cope with large deformation in tracking material particles due to severe distortion of cells, and the changing connectivity of the mesh seems especially attractive for solving such issues. The mesh with large deformation based on computational geometry is optimized by using new method. This paper develops a processing system for arbitrary polygonal unstructured grid, the intelligent variable grid neighborhood technologies is utilized to improve the quality of mesh in calculation process, and arbitrary polygonal mesh is used in the Lagrangian finite volume scheme. The performance of the new method is demonstrated through series of numerical examples, and the simulation capability is efficiently presented in coping with the systems with large deformations. |
| Key words: Lagrangian scheme; large deformations; altering connectivity of mesh; finite volume method |