Unstructured Grid-Based Finite Element Forward Modeling Method for Electromagnetic Fields

Abstract

In complex terrain modern day geophysical electromagnetic work or microwave engineering needs a good model of the electro magnetic field to succeed. The outdated numerical calculations relying equally distributed reguar grid finite diff, and un-even grounds like waves, faults, all sorts of messed up 3D anomalous distortions, it would greatly warp the local EM field response data points in ALL but maybe some last steps before 'inverted', and trying to interpret that result. In order to solve the bottleneck problem, we explore and realize a 3D vector finite element forward modeling method of electromagnetism field with unstructured tetrahedron grids. Utilizes very closely conformed unstructured grids to closely approximate complicated geological model and also has vector basic function based on edge element to remove these kinds of pseudo solution that you have when you do normal node FEM method. This article describes how to obtain the weak form integral equation of Maxwell’s equation of the electric field curl and introduces a pre-process Krylov subspace iteration solution strategy for solving big sparse complex linear equations. It is also the proof for truth of both its accuracy and strength in converging, it has experienced a lot of easy numerical check upon simple halfspace, roughest terrain and even most complicated bodies with deeply buried 3D high conductivity targets. The article can be considered true 3dfoward Model Theory Support and algorithm Basis To Get True Data Refinements And Exact Location Of Any Complex Geologic Body Within China while carrying out an Electromagnetic Investigation.