2D MT numerical simulation using FEM based on bi-tree grid
Zhang Zhiyong1, Liu Qingcheng2
1. School of Geosciences and Info-Physics,Central South University,Changsha,Hunan 410083,China;
2. Key Laboratory of Nuclear Resources and Environment of Ministry of Education,East China Institute of Technology,Nanchang,Jiangxi 330013,China
Abstract：The computation efficiency of numericalsimulation depends directly on the number of nodes cre-ated by the discrete model.Usually the magneto-telluric forward modeling increases the verticalsteps and reduces the vertical discrete nodes.But itis difficult to increase the horizontal steps with thedepth by the regular discrete method.In view ofthis situation, we propose a model discrete algo-rithm based on the binary tree structure.Using bi-tree，the algorithm calculates quadrilaterals，andthen performs triangulation on the quadrilaterals.It is easy to achieve double quadratic interpolationby inserting the middle point at side of triangle.The triangle with middle points can be triangulatedinto four sub-triangles. The numerical simulationsdemonstrate that this method greatly improvescomputation efficiency with fewer nodes while theforward modeling accuracy matches with that ofthe regular discrete method.
张志勇, 刘庆成. 基于收缩二叉树结构网格剖分的大地电磁二维有限单元法正演研究[J]. 石油地球物理勘探, 2013, 48(3): 482-487.
Zhang Zhiyong, Liu Qingcheng. 2D MT numerical simulation using FEM based on bi-tree grid. OGP, 2013, 48(3): 482-487.
