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COMPUTATIONAL HIGH FREQUENCY WAVE DIFFRACTION BY A CORNER VIA THE LIOUVILLE EQUATION AND GEOMETRIC THEORY OF DIFFRACTION

机译:利用LIOUVILLE方程和衍射几何理论通过角计算高频衍射

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摘要

We construct a numerical scheme based on the Liouville equation of geometric optics coupled with the Geometric Theory of Diflraction (GTD) to simulate the high frequency linear waves diflracted by a corner. While the reflection boundary conditions are used at the boundary, a diflraction condi- tion, based on the GTD theory, is introduced at the vertex. These conditions are built into the numerical flux for the discretization of the geometrical op- tics Liouville equation. Numerical experiments are used to verify the validity and accuracy of this new Eulerian numerical method which is able to capture the physical observable of high frequency and diflracted waves without fully resolving the high frequency numerically.
机译:我们基于几何光学的Liouville方程和几何衍射理论(GTD)构造了一个数值方案,以模拟由角衍射的高频线性波。在边界处使用反射边界条件时,基于GTD理论的衍射条件会在顶点处引入。这些条件被内置到数值通量中,以离散化几何光学Liouville方程。通过数值实验验证了这种新的欧拉数值方法的有效性和准确性,该方法能够捕获高频和绕射波的物理观测结果,而无需完全解析高频。

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