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FDTD (Finite-Difference Time-Domain)-based three-dimensional induction-polarization double-field numerical simulation method

A finite difference in time domain and numerical simulation technology, applied in design optimization/simulation, electrical digital data processing, special data processing applications, etc., to achieve the effect of reducing the use of memory

Active Publication Date: 2016-08-24
JILIN UNIV
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Problems solved by technology

[0006] Canadian patent CA2388271 discloses an electromagnetic field calculation method based on the time-domain finite difference method, and proposes a grid division method and data storage method based on two-dimensional conductors, but only involves numerical calculation of the induced field

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  • FDTD (Finite-Difference Time-Domain)-based three-dimensional induction-polarization double-field numerical simulation method
  • FDTD (Finite-Difference Time-Domain)-based three-dimensional induction-polarization double-field numerical simulation method
  • FDTD (Finite-Difference Time-Domain)-based three-dimensional induction-polarization double-field numerical simulation method

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[0045] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. Taking the uniform half-space model, the layered earth model, and the three-dimensional anomalous body model as examples, the three-dimensional induction-polarization dual-field electromagnetic response calculation of the time-domain finite difference is carried out. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. see figure 1 to combine figure 2 As shown, a finite-difference time-domain three-dimensional induction-polarization dual-field numerical simulation method includes:

[0046] 1. Based on the Dubai model (Cole-Cole complex resistivity model when the frequency correlation coefficient c=1), first obtain the frequency domain form of the Dubai model conductivity, an...

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Abstract

The invention relates to an FDTD (Finite Difference Time Domain)-based three-dimensional induction-polarized double-field numerical simulation method, which aims to quickly calculate electromagnetic response of induction-polarization double fields of a three-dimensional model. The FDTD-based three-dimensional induction-polarized double-field numerical simulation method mainly comprises the following steps of obtaining a time-domain expression of electric conductivity of a Dubai model by adopting inverse Laplace transformation; constructing an e index auxiliary equation of electric conductivity parameters; obtaining an ohm law time-domain discrete recursion expression through a trapezoidal integral method; reducing four-dimensional numeric operation into three-dimensional operation; substituting a formula into a passive Maxwell curl equation; deriving an iterative equation of an electric field and a magnetic field based on a three-dimensional FDTD method, thus completing electromagnetic response numerical calculation of the induction-polarization double fields of the three-dimensional model. The FDTD-based three-dimensional induction-polarized double-field numerical simulation method disclosed by the invention aims to solve the problems of long time-domain convolution operation of Ohm law, large memory occupation and the like, and the electromagnetic response numerical calculation of the induction-polarization double fields of the three-dimensional model is finally realized.

Description

technical field [0001] The invention relates to a time-domain electromagnetic field numerical simulation method in the field of geophysical exploration, and is especially suitable for rapidly calculating the induction-polarization double-field electromagnetic response of a three-dimensional model. Background technique [0002] Transient electromagnetic method (Time-domain Electromagnetic, referred to as TEM) is an underground near-surface detection method based on the electromagnetic induction eddy current effect. When the frequency is low, the electromagnetic field generated by displacement current and polarized charge is ignored, and only the eddy current effect of the underground medium is used to observe the secondary transient field. Time-domain Induced Polarization (IP for short) is a shallow underground detection method based on the polarization effect of the underground medium. It mainly uses an electrical source to apply a DC or AC electromagnetic field excitation, ...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 嵇艳鞠吴燕琪关珊珊黄廷哲吴琼王远
Owner JILIN UNIV
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