2021/10/18 by Yu Cheng, Yuhui Wang, Cheng, Yu +11
Engineering · Physics and Astronomy · #Computational Engineering #Electromagnetic Scattering and Analysis #Electromagnetic Simulation and Numerical Methods #FOS: Computer and information sciences #Finance #Microwave Engineering and Waveguides #and Science (cs.CE)
paper · pdf · doi:10.48550/arxiv.2110.09054
openalex publication_date 2021/10/18 · openalex created_date 2021/10/25 · openalex updated_date 2026/07/28
We proposed a provably stable FDTD subgridding method for accurate and efficient transient electromagnetic analysis. In the proposed method, several field components are properly added to the boundaries of Yee's grid to make sure that the discrete operators meet the summation-by-parts (SBP) property. Then, by incorporating the simultaneous approximation terms (SATs) into the finite-difference time-domain (FDTD) method, the proposed FDTD subgridding method mimics the energy estimate of the continuous Maxwell's equations at the semi-discrete level to guarantee its stability. Further, to couple multiple mesh blocks with different mesh sizes, the interpolation matrices are also derived. The proposed FDTD subgridding method is accurate, efficient, easy to implement and be integrated into the existing FDTD codes with only simple modifications. At last, three numerical examples with fine structures are carried out to validate the effectiveness of the proposed method.