Abstract
This paper is concerned with the stability and superconvergence analysis of the famous finite-difference time-domain (FDTD) scheme for the 2D Maxwell equations in a lossy medium with a perfectly electric conducting (PEC) boundary condition, employing the energy method. To this end, we first establish some new energy identities for the 2D Maxwell equations in a lossy medium with a PEC boundary condition. Then by making use of these energy identities, it is proved that the FDTD scheme and its time difference scheme are stable in the discrete L 2 and H 1 norms when the CFL condition is satisfied. It is shown further that the solution to both the FDTD scheme and its time difference scheme is second-order convergent in both space and time in the discrete L 2 and H 1 norms under a slightly stricter condition than the CFL condition. This means that the solution to the FDTD scheme is superconvergent. Numerical results are also provided to confirm the theoretical analysis.
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Gao, L., Zhang, B. Stability and superconvergence analysis of the FDTD scheme for the 2D Maxwell equations in a lossy medium. Sci. China Math. 54, 2693–2712 (2011). https://doi.org/10.1007/s11425-011-4305-7
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DOI: https://doi.org/10.1007/s11425-011-4305-7
Keywords
- Maxwell equations
- finite-difference time-domain method
- stability
- superconvergence
- perfectly electric conducting boundary conditions
- energy identities