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本文将有限元直接迭代算法 ( DIFE)用于 MT二维正演计算 ,充分利用了有限元直接迭代算法同时具有有限元和有限差分基本特征的优点。文中首先简要阐明了 DIFE的基本原理 ,并以此为基础编制了 MT二维正演计算的通用程序。在编程中 ,采用交叉对称三角形网格离散模型、交替方向线松弛算法求解有限元方程组、二次插值函数求解辅助场 ;在 TE极化模式下 ,在空气中考虑了介电常数以及地形的影响。实例说明本文所采用的方法在适应性 (包括模型的适应性和网格的适应性 )、计算精度、存储量和计算速度上都收到了较满意的效果
In this paper, finite element direct iterative algorithm (DIFE) is applied to two-dimensional forward modeling of MT, which takes full advantage of the finite element direct iterative algorithm with both finite element and finite difference basic features. First of all, the basic principle of DIFE is briefly described. Based on this, a general program of two-dimensional forward modeling of MT is developed. In the programming, the cross-symmetric triangular grid discrete model is adopted, the alternating direction line relaxation algorithm is used to solve the finite element equations and the quadratic interpolation function is used to solve the auxiliary field. In the TE polarization mode, the dielectric constant and topography influences. Examples illustrate the method used in this article in the adaptation (including the adaptability of the model and grid adaptability), calculation accuracy, storage and calculation speed have received more satisfactory results