三维有限差分法中提高计算水平磁场准确度的方法

IMPROVED TREATMENTS FOR EVALUATING HORIZONTAL MAGNETIC COMPONENTS THROUGH THE 3-D FDM IN E-POLARIZATION INDUCTION PROBLEMS

为提高三维有限差分法的计算准确度,本文用地表边条件修改了原来的计算程序.新方法新程序通过计算Wannamaker等的模型,检验其效果.结果表明,新程序显著提高了水平磁场值的准确性,同时也改进了垂直分量的计算.

To improve the accuracy of the numerical evaluation through the 3D finite difference method, the surface boundary conditions are added to modifying the old program. The author has tested the new program by making calculations for the model constructed by Wanamaker, et al (1984). The comparison between the numerical results obtained from this paper and those by Wannamaker, et al (1984) indicates that a pronounced improvement is realized in the evaluation of the horizontal magnetic components. Moreover, better calculations for the vertical magnetic components are also obtainable by using the new program.