A Fast Preconditioned Iterative Algorithm for the Electromagnetic Scattering from a Large Cavity

A Fast Preconditioned Iterative Algorithm for the Electromagnetic Scattering from a Large Cavity
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大腔体电磁散射的快速预条件迭代算法

DOI:
10.1007/s10915-012-9580-0
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发表时间:
2012-11
影响因子:
2.5
通讯作者:
乔中华
乔中华
中科院分区:
数学2区
文献类型:
--
作者:
李郴良;乔中华

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本文提出了一种快速预处理 Krylov 子空间迭代算法,用于解决嵌入无限地平面中的矩形大型开放腔的电磁散射问题。散射问题由亥姆霍兹方程描述,腔孔径上有非局部人工边界条件,腔壁上有狄利克雷边界条件。采用紧凑四阶有限差分格式来离散化有界域问题。通过在水平方向引入离散傅里叶变换和在垂直方向引入高斯消去法,可以简化小得多的界面离散系统,如 Bao 和 Sun (SIAM J. Sci. Comput. 27:553, 2005) 中提出的。为 Krylov 子空间迭代求解器开发了一种有效的预处理器来求解该接口系统。数值结果证明了该方法的显着效率和准确性。
In this paper, a fast preconditioned Krylov subspace iterative algorithm is proposed for the electromagnetic scattering from a rectangular large open cavity embedded in an infinite ground plane. The scattering problem is described by the Helmholtz equation with a nonlocal artificial boundary condition on the aperture of the cavity and Dirichlet boundary conditions on the walls of the cavity. Compact fourth order finite difference schemes are employed to discretize the bounded domain problem. A much smaller interface discrete system is reduced by introducing the discrete Fourier transformation in the horizontal and a Gaussian elimination in the vertical direction, presented in Bao and Sun (SIAM J. Sci. Comput. 27:553, 2005). An effective preconditioner is developed for the Krylov subspace iterative solver to solve this interface system. Numerical results demonstrate the remarkable efficiency and accuracy of the proposed method.
DOI: 10.1016/j.jcp.2005.11.007
发表时间: 2006-07
期刊: J. Comput. Phys.
影响因子: --
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