|Table of Contents|

Numerical Simulation of Seismic Wave in VTI Media Based on Orthogonal Body-fitted Grid(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2023年第02期
Page:
168-178
Research Field:
应用地球物理
Publishing date:

Info

Title:
Numerical Simulation of Seismic Wave in VTI Media Based on Orthogonal Body-fitted Grid
Author(s):
LIU Zhi-qiang;  LI Gang-zhu*;  HUANG Lei;  XU Lei;  LI Wen-bao
(Water Conservancy and Civil Engineering College, Inner Mongolia Agricultural University, Hohhot 010018, Inner Mongolia, China)
Keywords:
orthogonal body-fitted grid;  VTI media;  seismic wave;  numerical simulation;  irregular surface;  free boundary condition;  finite difference method;  stepped grid
PACS:
P315.3+1
DOI:
10.19814/j.jese.2022.10024
Abstract:
In order to solve the complex coordinate transformation and interpolation operations when the regular grid finite difference method deals with the free boundary conditions of irregular surface, as well as the false scattered waves generated by the stepped discrete approximation of irregular surface, the orthogonal body-fitted gird generation technique in computational fluid mechanics was introduced into the mesh generation of VTI media under irregular surface. The DRP/opt MacCormack finite difference method based on the collocated grid was used to simulate seismic waves in VTI media under the irregular surface. The orthogonality of the grid eliminates the need for complex coordinate transformation and interpolation operations in the implementation of free boundary conditions. Numerical examples show that the proposed grid generation method can effectively eliminate the false scattered waves generated by the stepped grid, thus improve the accuracy of seismic numerical simulation in VTI media under the irregular surface.

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Last Update: 2023-05-20