格子Boltzmann模型的熵平衡与色散振荡
Entropy Balance and Dispersive Oscillations in Lattice Boltzmann Models
摘要:
利用熵格子玻尔兹曼方法(ELBM)研究了激波后的色散振荡。为此,我们使用一个寻根算法来实现ELBM,它显示快速的三次收敛性和正确的耗散符号。一维激波管的模拟结果表明,在正则化方面,使用ELBM的标准LBGK方法没有任何好处。我们还进行了一个实验调查的LBGK方法使用中值滤波在一个单一的时间步长点。在这里,我们观察到可以实现显著的正则化。
英文摘要:
We conduct an investigation into the dispersive post-shock oscillations in the entropic lattice-Boltzmann method (ELBM). To this end we use a root finding algorithm to implement the ELBM which displays fast cubic convergence and guaranties the proper sign of dissipation. The resulting simulation on the one-dimensional shock tube shows no benefit in terms of regularization from using the ELBM over the standard LBGK method. We also conduct an experiment investigating of the LBGK method using median filtering at a single point per time step. Here we observe that significant regularization can be achieved.
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