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arXiv 1407.7563math.NAcs.NA
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时域里普曼-施瓦茨方程与卷积四阶法

The Time Domain Lippmann-Schwinger Equation and Convolution Quadrature

Center for Industrial Mathematics, University of Bremen(不来梅大学工业数学中心);Department of Mathematical Sciences, University of Delaware(特拉华大学数理科学系)

Armin Lechleiter, Peter Monk

AI总结:

本文研究了时域声学散射问题,采用卷积四阶法和三角格点法求解体积里普曼-施瓦茨积分方程,并证明了该方程的唯一解及数值解的收敛性和误差估计。

摘要:

我们考虑了具有可变声速的穿透介质的时域声学散射问题。该问题可以归结为求解时域体积里普曼-施瓦茨积分方程。利用时间域上的卷积四阶法和空间域上的三角格点法,可以计算出近似解。我们证明了时域里普曼-施瓦茨方程具有唯一解,并证明了对于光滑声速的完全离散解的条件收敛性和误差估计。初步的数值结果表明,即使对于不连续的声速,该方法也表现良好。

英文摘要:

We consider time domain acoustic scattering from a penetrable medium with a variable sound speed. This problem can be reduced to solving a time domain volume Lippmann-Schwinger integral equation. Using convolution quadrature in time and trigonometric collocation in space we can compute an approximate solution. We prove that the time domain Lippmann-Schwinger equation has a unique solution and prove conditional convergence and error estimates for the fully discrete solution for smooth sound speeds. Preliminary numerical results show that the method behaves well even for discontinuous sound speeds.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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