Anisotropic perfectly matched layer absorbing boundary condition used for biaxial media

2002 ◽  
Author(s):  
Hongxing Zheng ◽  
Cheng Zhang ◽  
Debiao Ge
Keyword(s):  
Boundary Condition ◽  
Perfectly Matched Layer ◽  
Absorbing Boundary Condition ◽  
Absorbing Boundary ◽  
Anisotropic Perfectly Matched Layer

An Absorbing Boundary Condition Based on Perfectly Matched Layer Technique Combined with Discontinuous Galerkin Boltzmann Method for Low Mach Number Flow Noise

2018 ◽  
Vol 26 (04) ◽  
pp. 1850011 ◽  
Author(s):  
Weidong Shao ◽  
Jun Li
Keyword(s):  
Boundary Condition ◽  
Discontinuous Galerkin ◽  
Perfectly Matched Layer ◽  
Absorbing Boundary Condition ◽  
Time Behavior ◽  
Computational Domain ◽  
Mean Flow ◽  
Absorbing Boundary ◽  
Flow Noise ◽  
Boltzmann Method

For flow noise simulations, the nonreflecting boundary condition (NRBC) is significant to confine the computational domain to a small domain. Lattice Boltzmann method (LBM) has advantages for noise because of its low dissipation, but is limited to the uniform grid. In this paper, an absorbing boundary condition (ABC) based on perfectly matched layer (PML) technique is introduced to LBM. Then PML stability is analyzed and a new strategy is developed to achieve robustness. Invoking the decoupling time integration, the underlying equation for streaming is solved with the nodal discontinuous Galerkin method. Benchmark acoustic problems were used to demonstrate the PML absorption. Moreover, PML parameters, long time behavior and inhomogeneous pseudo mean flow are discussed. The methodology appears to work very well and would be hoped for practical flow noise computation.

Perfectly matched layer absorbing boundary condition for nonlinear two-fluid plasma equations

2015 ◽  
Vol 286 ◽  
pp. 128-142 ◽  
Author(s):  
X.F. Sun ◽  
Z.H. Jiang ◽  
X.W. Hu ◽  
G. Zhuang ◽  
J.F. Jiang ◽  
...  
Keyword(s):  
Boundary Condition ◽  
Perfectly Matched Layer ◽  
Absorbing Boundary Condition ◽  
Absorbing Boundary ◽  
Two Fluid ◽  
Two Fluid Plasma
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