Finite-element numerical modeling of elastic wave on unstructured meshes
Shi Ruiqi1,2, Wang Shangxu1, Guo Rui1, Zhao Jianguo1
1. CNPC Key Lab of Geophysical Prospecting, China University of Petroleum (Beijing), Beijing 102249, China;
2. CNOOC Research Institute, Beijing 100027, China
Abstract：When using finite-element time-domain method for the numerical modeling of complex geological structures,the unstructured meshes can be more efficiently adapted to the space-discretization for the complex geometries.In this paper,a specific optimization for the finite-element gridding is presented according to the numerical dispersion condition in space and the stability condition in explicit time-marching scheme,making the grid size varied versus the media speed of the simulation region.The calculation for two-layer model demonstrates that the variation of grid size versus velocity can guarantee the computational efficiency and precision contemporaneously.And the calculation for complex structure model demonstrates that the finite-element scheme with unstructured meshes can be adapted to the seismic wave modeling of complex geological structures.
