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《Journal of Central South University(Science and Technology)》 2014-08
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2.5-D DC resistivity forward modeling by finite-infinite element coupling method

XIAO Xiao;YUAN Yuan;TANG Jingtian;Key Laboratory of Metallogenic Prediction of Nonferrous Metals, Ministry of Education,School of Geosciences and Info-Physics, Central South University;  
To solve the problems caused by artificial boundary conditions in conventional finite element modeling, a new 2.5D DC resistivity finite-infinite coupling method was proposed. Firstly, the 2.5D mapping functions of infinite elements were derived. Then, a new type of shape functions was proposed. Infinite element method was integrated into conventional finite element method to replace the mixed boundary conditions, which made the electrical potential distribute continuously in half space and decay to 0 at infinity. Meanwhile, the global system matrix was independent of the locations of source points but still sparse and symmetric. The results show that the finite-infinite coupling method can obtain a more accurate solution than traditional FEM method in the same meshing area, and reasonable numerical solutions can be obtained in a relatively small meshing area. Due to the reduction of the discretization domain and node, it can improve the calculation speed. A more superior property is the invariability of the global system matrix with variant source positions which makes this new method alleviate the computational burden and speed up inversions.
【Fund】: 国家公益性行业基金资助项目(SinoProbe-03);; 国家自然科学基金资助项目(41174105 41104071 41204082);; 中南大学研究生学位论文创新基金资助项目(2011ssxt063)
【CateGory Index】: P631.322
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