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Loading method of C-PML boundary conditions during time-domain airborne electromagnetic numerical simulation

A technology of aeronautical electromagnetic and numerical simulation, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve problems that do not involve processing methods, reduce calculation time, etc.

Active Publication Date: 2016-07-27
JILIN UNIV
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Problems solved by technology

[0009] The method mentioned above discloses a method to improve the calculation accuracy of electromagnetic response by using absorbing boundary conditions, but none of the domestic and foreign patents involves the loading method of C-PML absorbing boundary conditions with variable step size and the processing of divergence conditions in the C-PML layer method, for time-domain aviation three-dimensional transient electromagnetic calculation, the loading of boundary conditions is very important, how to improve the calculation accuracy while reducing the calculation time is a technical problem to be solved urgently by those skilled in the art

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  • Loading method of C-PML boundary conditions during time-domain airborne electromagnetic numerical simulation
  • Loading method of C-PML boundary conditions during time-domain airborne electromagnetic numerical simulation
  • Loading method of C-PML boundary conditions during time-domain airborne electromagnetic numerical simulation

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Embodiment

[0067] see figure 1 , a method for loading C-PML boundary conditions in time-domain airborne electromagnetic numerical simulation, including:

[0068] 1), using the divergence equation As the governing equation of the vertical component of the magnetic field, under quasi-static conditions, the passive Maxwell curl equation is used as the governing equation of other electromagnetic field components. Combined with non-uniform Yee grid and DuFort-Frankel method to construct an explicit difference scheme, the number of grids is 107× 107×53, the number of grids in the x and y directions is 107, the number of grids in the z direction is 53, the minimum and maximum grid steps are 10m and 120m respectively, and the other 5 sides of the calculation area are the outermost Layer 8 meshes loaded with C-PML layers.

[0069] 2) Set parameters such as conductivity, magnetic permeability, and C-PML coefficient in the entire calculation area. The model in the calculation example is a unifor...

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Abstract

The invention relates to a loading method of C-PML boundary conditions during time-domain airborne electromagnetic numerical simulation.By introducing a divergence equation (please see the formula in the description) as a control equation of a magnetic field vertical component, electric field and magnetic field expressions in a C-PML layer are deduced, and electromagnetic field no-reflection conditions on an interface of the C-PML layer are determined.A time-domain convolution variable-step-size recursive algorithm in the C-PML layer is constructed through a range-variation integral method, storage of electromagnetic field values at each moment is avoided, a corresponding electric field and magnetic field difference-iteration form is deduced based on a finite difference method, and finally time-domain airborne three-dimensional later period high-precision and long-time-window calculation is achieved.The loading method of the C-PML boundary conditions during time-domain airborne electromagnetic numerical simulation aims at overcoming the truncation error problem of a calculation area in time-domain airborne electromagnetic numerical simulation and can more efficiently and accurately calculate the three-dimensional time-domain electromagnetic responses.

Description

technical field [0001] The invention relates to an accurate calculation method of time-domain electromagnetic response in the field of geophysical exploration, in particular to an accurate numerical calculation method for time-domain airborne electromagnetic response. Background technique [0002] Time domain airborne transient electromagnetic methods (Timedomain Airborne Transient electromagnetic methods) both the transmitting system and the receiving system are in the air. Compared with time domain ground transient electromagnetic methods (Timedomain Ground Transient electromagnetic methods), time domain airborne electromagnetic methods can be more adaptable to the complex and changeable geological environment. It is widely used in metal ore, coal, oil and gas exploration, hydrogeological investigation and environmental monitoring and other fields. [0003] In the finite-difference time-domain (Finite-difference Time-domain) algorithm, there is a truncation boundary error ...

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Application Information

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IPC IPC(8): G06F19/00
CPCG16Z99/00
Inventor 嵇艳鞠赵雪娇关珊珊林君王远朱宇
Owner JILIN UNIV
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