arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1906.04722physics.comp-phcond-mat.mtrl-sci
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基于格子玻尔兹曼方法直接模拟的混合多相模型

A Hybrid multiphase model based on lattice Boltzmann method direct simulations

Eduard Puig Montellà, Chao Yuan, Bruno Chareyre, Antonio Gens

摘要:

利用多组分Shan-Chen格子玻尔兹曼方法(LBM)研究了多孔介质中的多相流问题。尽管LBM具有出色的精度,但大型域导致无法负担的计算费用。在这项研究中开发的混合模型是基于孔网络(PN)的方法,增强了分解成小的子集(孔喉)的颗粒组装。格子玻尔兹曼模拟进行每个孔喉,以确定在微观尺度上的流体动力学特性(入口毛细管压力,主要排水曲线,液体形态,等)。LBM获得的局部属性被合并在网络中,以解决更大规模的问题。这种策略导致显着减少的计算时间在样本规模相比,一个完全解决的方法。流体形态和相分布进行了评估,在排水过程中的一个小颗粒组装使用的混合模型(PN-LBM)。结果进行了对比,在一个完全解决的模拟(LBM)。这两个模型之间的协议说明了混合方法的能力,它结合了PN方法的效率和LBM在孔隙尺度的准确性。

英文摘要:

By means of the multicomponent Shan-Chen lattice Boltzmann method (LBM), we investigate the multiphase flow through porous media. Despite the excellent accuracy of the LBM, large domains result in unaffordable computational expenses. The Hybrid model developed in this study is based on a pore-network (PN) approach that enhances a decomposition of the granular assembly into small subsets (pore throats). Lattice Boltzmann simulations are performed for each pore throat to determine the hydrodynamic properties (entry capillary pressure, primary drainage curve, liquid morphology, etc) at the microscale. The local properties obtained with LBM are incorporated at the network to solve the larger-scale problem. This strategy leads to a significant decrease of the computation time at the sample-scale compared to a fully resolved method. Fluid morphology and phase distribution are evaluated during the drainage of a small granular assembly using the Hybrid model (PN-LBM). Results are contrasted with those obtained in a fully resolved simulation (LBM). The agreement between the two models illustrates the capability of the Hybrid method, which combines the efficiency of the PN approach and the accuracy of the LBM at the pore scale.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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