Calculation method of fvfd far-field integral boundary condition with reduced grid usage

A technology of boundary conditions and far-field integration, applied in the field of numerical solution in the frequency domain of electromagnetism, can solve problems such as increased grid size and calculation burden, difficult application, and influence on numerical calculation accuracy, and achieves convergence standards with reduced iteration steps, The effect of reducing the number of spatial grids and improving non-reflection performance
CN112989680BActive Publication Date: 2021-07-16CALCULATION AERODYNAMICS INST CHINA AERODYNAMICS RES & DEV CENT
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Patents(China)
Current Assignee / Owner
CALCULATION AERODYNAMICS INST CHINA AERODYNAMICS RES & DEV CENT
Publication Date
2021-07-16

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Abstract

The present invention provides a FVFD far-field integral boundary condition calculation method that reduces grid usage, establishes a simulation model, and circulates the virtual time step of the simulation model until the end of convergence; in each virtual time sub-iteration process, each The space flux calculation and the implicit iterative solution calculation are performed on the mesh grid and each grid unit, and the next-level virtual time sub-iteration steps are updated to conserve the electromagnetic field value. The MUSCL format interpolation is used to calculate the state variables at the corresponding boundaries inside the area, and the equivalent current and magnetic current calculated at the internal virtual integral surface are used to calculate the external flow state variables. The invention reduces the Fourier transform link required for calculating the electromagnetic characteristics of the target in the time domain, and avoids a large number of convolution calculation problems encountered in the calculation of the boundary conditions of the same type of time domain integral equation.
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Description

technical field

[0001] The present invention relates to the technical field of numerical solution in the frequency domain of electromagnetics, in particular to a calculation method for FVFD (Finite Volume Frequency Domain, FVFD) far-field integral boundary conditions that reduces grid usage. Background technique

[0002] With the complexity of electromagnetic scattering of complex-shaped targets in engineering, electromagnetic interference in complex electromagnetic environments, and the improvement of computer storage and computing capabilities, numerical calculation of electromagnetic fields has become possible. Time-domain calculations are beneficial for simulating radiation and scattering of broadband pulsed electromagnetic signals, among which Finite Difference Time Domain (FDTD) and Finite Volume Time Domain (FVTD) are the most famous methods, but if the incident wave is Single-frequency harmonic signals can be calculated in the frequency domain. Traditional frequency...

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