A realization method of fully matched absorption boundary with extended coordinates in two-dimensional plasma

Abstract

The invention discloses a method for realizing the fully matching absorption boundary of extended coordinates in two-dimensional plasma, comprising the following steps: inputting model files; initializing parameters and setting parameters; adding field sources to the magnetic field component coefficients, and updating and calculating the entire calculation Regional magnetic field component coefficient; update and calculate the electric field component coefficient of the entire calculation area; update and calculate the intermediate variable coefficient of the entire calculation area; update and calculate the auxiliary variable of the electromagnetic field component coefficient of the entire calculation area; calculate the electromagnetic field component of the observation point; set p+1 Assign a value to p, and judge whether p reaches the preset value, if p does not reach the preset value, return to step 3; if p reaches the preset value, then end. The method for realizing the complete matching absorption boundary of extended coordinates in the two-dimensional plasma of the present invention has better absorption effect for low frequency and litter waves.

Description

technical field [0001] The invention belongs to the technical field of computational electromagnetics, and relates to a method for realizing a fully matching absorption boundary of extended coordinates in a two-dimensional plasma. Background technique [0002] It is well known that the time step of the Finite-difference time-domain (FDTD) method is limited by the Cauchy stability condition, which limits the application of the FDTD method in fine structure models. In order to eliminate the limitation of the Cauchy stability condition, unconditionally stable finite-difference time-domain methods have been proposed, such as: Alternating-Direction-Implicit (ADI) finite-difference time-domain (ADI-FDTD) method and weighted-based Laguerre polynomials Finite-difference time-domain (WLP-FDTD) method. Among these methods, the ADI-FDTD method will produce a large dispersion error when using a large time step, while the WLP-FDTD method can not only eliminate the limitation of the Cauc...

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Problems solved by technology

Someone proposed a perfectly matched layer (Perfectly matched layer, PML) absorption boundary. Later, PML was widely used to calculate the truncation of the area, and it was proved to be very effective. However, the research found that the traditional PML has an absorption effect on low frequencies and litter waves. Not ideal; using a PML (CFS-PML) absorption boundary with a complex frequency shift (CFS) factor can effectively improve the traditional PML's absorption effect for low frequencies, litter waves and glancing situations

Someone applied the CFS-PML absorption boundary to the WLP-FDTD method of ordinary media, and analyzed the absorption effect of CFS-PML and PML without CFS factor, but this method is more complicated when applied to plasma, and the calculation amount bigger

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