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基于非结构化风格的三维大地电磁矢量有限无模拟

机译:基于非结构化风格的三维大地电磁矢量有限无模拟

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摘要

Three-dimensional forward modeling is a challenge for geometrically complex magnetotellurics (MT) problems. We present a new edge-based finite-element algorithm using an unstructured mesh for accurately and efficiently simulating 3D MT responses. The electric field curl-curl equation in the frequency domain was used to deduce the H (curl) variation weak form of the MT forward problem, the Galerkin rule was used to derive a linear finite-element equation on the linear-edge tetrahedroid space, and, finally, a BI-CGSTAB solver was used to estimate the unknown electric fields. A local mesh refinement technique in the neighbor of the measuring MT stations was used to greatly improve the accuracies of the numerical solutions. Four synthetic models validated the powerful performance of our algorithms. We believe that our method will effectively contribute to processing more complex MT studies.
机译:三维前向建模是几何复杂磁通科(MT)问题的挑战。我们使用非结构化网格介绍了一种新的基于边缘的有限元算法,可准确,有效地模拟3D MT响应。频域中的电场卷曲 - 卷曲方程用于推导出MT前进问题的H(卷曲)变化弱形式,使用Galerkin规则来导出线性边缘空间上的线性有限元方程,最后,使用Bi-cgstab求解器来估计未知的电场。测量MT站邻居中的局部网格细化技术用于大大提高数值解决方案的精度。四种合成模型验证了我们算法的强大性能。我们认为,我们的方法将有效地促进处理更复杂的MT研究。

著录项

  • 来源
    《应用地球物理(英文版)》 |2008年第3期|170-180|共11页
  • 作者单位

    School of Info-physics and Geometrics Engineering, Central South University, Changsha 410083, China;

    Changsha Aeronautical Vocational and Technical College, Changsha 410124, China;

    School of Info-physics and Geometrics Engineering, Central South University, Changsha 410083, China;

    Institute of Geophysics, ETH-Swiss Federal Institute of Technology, Zurich 8092, Switzerland;

    School of Info-physics and Geometrics Engineering, Central South University, Changsha 410083, China;

    Institute of Higher Education, Central South University, Changsha 410083, China.;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 chi
  • 中图分类 物理学;
  • 关键词

    Magnetotelluric modeling; edge-based finite-element; unstructured mesh; local mesh refinement;

  • 入库时间 2022-08-19 04:09:37

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