Physical modeling of multiphase flow via lattice Boltzmann method: Numerical effects, equation of state and boundary conditions

Physical modeling of multiphase flow via lattice Boltzmann method: Numerical effects, equation of state and boundary conditions
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通过格子玻尔兹曼方法进行多相流物理建模:数值效应、状态方程和边界条件

DOI:
10.1007/s11467-012-0245-0
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发表时间:
2012-02
影响因子:
7.5
通讯作者:
Li Ying-Jun
Li Ying-Jun
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Gan Yan-Biao;Xu Ai-Guo;Zhang Guang-Cai;Li Ying-Jun

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本文件有三个目的。首先,我们进一步研究了Phys. Rev. E,2011,84(4):046715中提出的货车德瓦尔斯(VDW)流体的快速傅里叶变换热晶格玻尔兹曼(FFT-TLB)模型。我们分析了FFT方法相对于传统差分格式的优点,并详细研究了平滑因子对精度和稳定性的影响。其次,我们将可变参数的VDW状态方程引入FFT-TLB模型。因此,修正后的模型可用于处理具有不同临界密度和温度的多相流。第三,我们设计适当的边界条件,系统与固体壁。这些改进,从数值和物理的角度,显着扩大了该模型在科学和工程中的应用范围。
The aims of the present paper are threefold. First, we further study the fast Fourier transform thermal lattice Boltzmann (FFT-TLB) model for van der Waals (VDW) fluids proposed in Phys. Rev. E, 2011, 84(4): 046715. We analyze the merits of the FFT approach over the traditional finite difference scheme and investigate the effects of smoothing factors on accuracy and stability in detail. Second, we incorporate the VDW equation of state with flexible parameters into the FFT-TLB model. As a result, the revised model may be used to handle multiphase flows with various critical densities and temperatures. Third, we design appropriate boundary conditions for systems with solid walls. These improvements, from the views of numerics and physics, significantly extend the application scope of the model in science and engineering.
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