论文标题
基于非平衡对称性的假设，LBM的非反射边界条件
A non-reflective boundary condition for LBM based on the assumption of non-equilibrium symmetry
论文作者
论文摘要
在这项研究中，提出了一种新型的非反射边界条件（NRBC），用于晶格玻尔兹曼法（LBM）。非平衡对称边界条件（NSBC）。这种边界条件背后的想法是利用非平衡分布函数的特征来为传入人群分配值。一种简单的基于梯度的外推技术和远场标准用于预测宏观流体变量。为了证明NSBC的非反射行为，已经进行了两种不同的测试，研究了边界分别吸收声波涡流的能力。两种测试的结果都表明，NSBC产生的反射量接近零。
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.
