Contact angles in the pseudopotential lattice Boltzmann modeling of wetting.
Contact angles in the pseudopotential lattice Boltzmann modeling of wetting.
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DOI：
10.1103/physreve.90.053301
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发表时间：
2014-10
期刊：
影响因子：
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通讯作者：
Qing Li;K. Luo;Q. Kang;Q. Chen
中科院分区：
文献类型：
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作者：
Qing Li;K. Luo;Q. Kang;Q. Chen
本文研究了在密度比ρ_{L}/ρ_{V}=500时赝势格子Boltzmann润湿模型中接触角的实现。赝势格子Boltzmann模型[X. Shan和H. Chen，Phys.Rev.E49，2941（1994）10.1103/PhysRevE.49.2941]是用于模拟多相流和界面动力学的流行的介观模型。在该模型中，接触角通常通过流体-固体相互作用来实现。对两种广泛应用的流固相互作用，即基于密度的相互作用和基于赝势的相互作用，以及本文提出的一种改进的基于赝势的相互作用进行了数值研究，并在可实现的接触角、最大和最小密度以及寄生电流方面进行了比较。与其他两种类型的流固相互作用相比，赝势相互作用在模拟小静态（液体）接触角θ90^{θ}时效果较好。此外，当流固相互作用力的引入时，寄生电流被放大。增加汽液相之间的运动粘度比被证明是能够减少由流体-固体相互作用引起的寄生电流。
In this paper we investigate the implementation of contact angles in the pseudopotential lattice Boltzmann modeling of wetting at a large density ratio ρ_{L}/ρ_{V}=500. The pseudopotential lattice Boltzmann model [X. Shan and H. Chen, Phys. Rev. E 49, 2941 (1994)10.1103/PhysRevE.49.2941] is a popular mesoscopic model for simulating multiphase flows and interfacial dynamics. In this model the contact angle is usually realized by a fluid-solid interaction. Two widely used fluid-solid interactions, the density-based interaction and the pseudopotential-based interaction, as well as a modified pseudopotential-based interaction formulated in the present paper are numerically investigated and compared in terms of the achievable contact angles, the maximum and the minimum densities, and the spurious currents. It is found that the pseudopotential-based interaction works well for simulating small static (liquid) contact angles θ90^{∘} as compared with the two other types of fluid-solid interactions. Furthermore, the spurious currents are found to be enlarged when the fluid-solid interaction force is introduced. Increasing the kinematic viscosity ratio between the vapor and liquid phases is shown to be capable of reducing the spurious currents caused by the fluid-solid interactions.