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A high frequency boundary element method for scattering by penetrable convex polygons. (arXiv:1704.07745v1 [math.NA])
来源于:arXiv
We present a novel hybrid numerical-asymptotic boundary element method for
transmission problems describing high frequency acoustic and electromagnetic
scattering by penetrable (dielectric) convex polygons. We demonstrate by means
of a range of numerical experiments that our boundary element method can
achieve a fixed accuracy of approximation using only a relatively small,
frequency-independent number of degrees of freedom. Our numerical approximation
space, which can be applied in the context of any direct boundary integral
equation formulation, approximates the unknown boundary solution as a sum of
the classical geometrical optics approximation, computed by a beam tracing
algorithm, plus a contribution due to diffraction, computed by a boundary
element method using oscillatory basis functions chosen to efficiently capture
the high frequency behaviour. For the scattering scenarios we consider, we show
that the inclusion of the diffraction term provides an order of magnitude
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