An efficient higher-order PML in WLP-FDTD method for time reversed wave simulation

作者：Wei, Xiao-Kun^*; Shao, Wei; Ou, Haiyan; Wang, Bing-Zhong

来源：Journal of Computational Physics, 2016, 321: 1206-1216.

DOI：10.1016/j.jcp.2016.06.032

• Channel characteristics
• Finite-difference time-domain (FDTD)
• Higher-order
• Laguerre polynomials
• Perfectly matched layer (PML)
• Time reversal (TR)

Derived from a stretched coordinate formulation, a higher-order complex frequency shifted (CFS) perfectly matched layer (PML) is proposed for the unconditionally stable finite-difference time-domain (FDTD) method based on weighted Laguerre polynomials (WLPs). The higher-order PML is implemented with an auxiliary differential equation (ADE) approach. In order to further improve absorbing performance, the parameter values of stretching functions in the higher-order PML are optimized by the multi-objective genetic algorithm (MOGA). The optimal solutions can be chosen from the Pareto front for trading-off between two independent objectives. It is shown in a numerical test that the higher-order PML is efficient in terms of attenuating propagating waves and reducing late time reflections. Moreover, the higher-order PML can be placed very close to the wall when analyzing the channel characteristics of time reversal (TR) waves in a multipath indoor environment. Numerical examples of TR wave propagation demonstrate the availability of the proposed method.

• 出版日期2016-9-15
• 单位电子科技大学