비 균일 격자에서의 가상 경계 기법

Immersed boundary method is very convenient method to solve particle-fluid interaction without the mesh generation. It has a biggest advantage that can reduce the computational time for solving the moving body. Recently, most people are using uniform discrete Dirac delta function for IBM. But it has a disadvantage, which is cannot conserve the information, when the mesh is non-uniform. Radial basis function interpolation can solve this problem. Radial basis function and Reproducing particle polynomial method have 1st order and 3 rd order accuracies when grid size is getting small. The result of RBF for the falling sphere in quiescent fluid is better than RPPM.