A finite volume method for global electromagnetic induction forward modeling on collocated unstructured grids

作     者：Liang Yin ZhengYong Ren HongBo Yao Cong Yang Liang Yin;ZhengYong Ren;HongBo Yao;Cong Yang

作者机构：State Key Laboratory of Lunar and Planetary SciencesMacao University of Science and TechnologyMacaoChina CNSA Macao Center for Space Exploration and ScienceMacaoChina School of Geosciences and Info-PhysicsCentral South UniversityChangsha 410083China Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment MonitoringMinistry of Education(Central South University)Changsha 410083China Hunan Key Laboratory of Nonferrous Resources and Geological Hazards ExplorationCentral South UniversityChangsha 410083China 

出 版 物：《Earth and Planetary Physics》 (地球与行星物理（英文版）)

年 卷 期：2023年第7卷第1期

页      面：57-65页

核心收录：

学科分类：070801[理学-固体地球物理学] 07[理学] 0708[理学-地球物理学] 0706[理学-大气科学] 0702[理学-物理学] 

基　　金：supported by the National Natural Science Foundation of China(41922027,4214200052) by the Macao Foundation by the Pre-research Project on Civil Aerospace Technologies No.D020308/D020303 funded by China National Space Administration by the Macao Science and Technology Development Fund,grant No.0001/2019/A1。 

主　　题：global electromagnetic induction mantle electrical conductivity finite volume method unstructured grids 

摘      要：Global electromagnetic induction provides an efficient way to probe the electrical conductivity in the Earth’s deep interior.Owing to the increasing geomagnetic data especially from high-accuracy geomagnetic satellites,inverting the Earth’s three-dimensional conductivity distribution on a global scale becomes attainable.A key requirement in the global conductivity inversion is to have a forward solver with high-accuracy and efficiency.In this study,a finite volume method for global electromagnetic induction forward modeling is developed based on unstructured grids.Arbitrary polyhedral grids are supported in our algorithms to obtain high geometric adaptability.We employ a cell-centered collocated variable arrangement which allows convenient discretization for complex geometries and straightforward implementation of multigrid technique.To validate the method,we test our code with two synthetic models and compare our finite volume results with an analytical solution and a finite element numerical solution.Good agreements are observed between our solution and other results,indicating acceptable accuracy of the proposed method.