| In this paper, we study the electromagnetic scattering from a large rectangular open cavity embedded in an infinity ground plane. By introducing a transparent boundary condition on the aperture of the cavity, the cavity scattering problem is reduced to finite domain problem, which in turn can be solved by using the bilinear element.From the superconvergence theory, we know that the vertex-edge-face interpolations have better superconvergent properties than the common Lagrange interpolations. In this Paper we introduce a new type of gradient recovery method based on vertex-edge-face interpolation, and analyze its superconvergence properties. Numerical examples are presented to shown the e?ciency of this recovery method.At last, we construct a interpolation postprocessing operator, we have the global superconvergence properties. |
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