| Summary: | A new approach suitable for determination of the maximal stable timeincrement for the Finite-Difference Time-Domain (FDTD) algorithm incommon curvilinear coordinates, for general mesh shapes and certaintypes of boundaries is presented. The maximal time incrementcorresponds to a characteristic value of a Helmholz equation that issolved by a finite-difference (FD) method. If this method uses exactlythe same discretization as the given FDTD method (same mesh, boundaryconditions, order of precision etc.), the maximal stable time incrementis obtained from the highest characteristic value. The FD system issolved by an iterative method, which uses only slightly alteredoriginal FDTD formulae. The Courant condition yields a stable timeincrement, but in certain cases the maximum increment is slightlygreater [2].
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