基于非平衡对称性假设的LBM无反射边界条件
A non-reflective boundary condition for LBM based on the assumption of non-equilibrium symmetry
摘要：
本文提出了一种新的适用于格子玻尔兹曼方法（LBM）的非反射边界条件：非平衡对称边界条件（NSBC）。这个边界条件背后的想法是利用非平衡分布函数的特性来为传入的种群赋值。一个简单的基于梯度的外推技术和远场准则被用来预测宏观流体变量。为了证明NSBC的非反射行为，进行了两项不同的测试，分别检查边界吸收声波和涡流的能力。这两个测试的结果表明，NSBC产生的反射量几乎为零。
英文摘要：
In this study a new type of non-reflective boundary condition (NRBC) for the Lattice Boltzmann Method (LBM) is proposed; the Non-equilibrium Symmetry Boundary Condition (NSBC). The idea behind this boundary condition is to utilize the characteristics of the non-equilibrium distribution function to assign values to the incoming populations. A simple gradient based extrapolation technique and a far-field criterion are used to predict the macroscopic fluid variables. To demonstrate the non-reflective behaviour of the NSBC, two different tests have been carried out, examining the capability of the boundary to absorb acoustic waves respectively vortices. The results for both tests show that the amount of reflection generated by the NSBC is nearly zero.
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