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首页> 外文期刊>International journal of numerical methods for heat & fluid flow >Application of many-body dissipative particle dynamics to determine liquid characteristics
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Application of many-body dissipative particle dynamics to determine liquid characteristics

机译：应用多体耗散粒子动力学确定液体特性

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Purpose - The purpose of this paper is to find out the applicability of the many-body dissipative particle dynamics (MDPD) method for various real fluids by specifically focusing on the effects of the MDPD parameters on the MDPD fluid properties. Design/methodology/approach - In this study, the MDPD method based on van der Waals (vdw) equation of state is employed. The simulations are conducted by using LAMMPS with some modifications of the original package to include the many-body features in the simulation. The simulations are investigated in a three-dimensional Cartesian box solution domain in which MDPD particles are distributed. In order to evaluate the MDPD liquid characteristics for a stationary liquid film, self-diffusivity, viscosity, Schmidt number (Sc) and surface tension, are estimated for different MDPD parameters. The parameters are carefully selected based on previous studies. A set of single-droplet simulations is also performed to analyze the droplet characteristics and its behavior on a solid-wall. Besides, the relationship between the characteristic length in the DPD simulations and scaling parameters for the stationary liquid-film case is discussed by employing the Ohnesorge number. Findings - The results show that the liquid properties in the MDPD simulations can be widely ranged by varying the MDPD parameters. The values are highly influenced by the many-body feature in the conservative force which is not included in the original DPD method. It is also found that the wetting ability of the MDPD fluid on solid walls can be easily controlled by changing a many-body parameter. The characteristic length between the MDPD reduced unit and real unit is related for the stationary liquid-film case by employing the Ohnesorge number. Originality/value - The present parametric study shows that the liquid properties in the MDPD method can vary by carefully controlling the MDPD parameters, which demonstrates the high-potential applicability of the method for various real fluids. This will contribute to research areas in multi-phase transport phenomena at nano and sub-micron scales in, for example, fuel cells, batteries and other engineering devices involving porous media.
机译：目的-本文的目的是通过特别关注MDPD参数对MDPD流体特性的影响，来发现多体耗散粒子动力学（MDPD）方法对各种真实流体的适用性。设计/方法/方法-在这项研究中，采用了基于范德华（vdw）状态方程的MDPD方法。通过使用LAMMPS对原始包装进行一些修改以在仿真中包括多体功能来进行仿真。在其中分布了MDPD粒子的三维笛卡尔框解域中研究了仿真。为了评估固定液膜的MDPD液体特性，针对不同的MDPD参数估算了自扩散性，粘度，施密特数（Sc）和表面张力。这些参数是根据以前的研究精心选择的。还执行了一组单液滴模拟，以分析液滴特性及其在固体壁上的行为。此外，通过利用欧姆数来讨论在固定的液膜情况下DPD模拟中的特征长度和定标参数之间的关系。结果-结果表明，通过更改MDPD参数，可以在MDPD模拟中广泛地改变液体性质。该值受保守力中多体特征的影响很大，而原始DPD方法中并未包括该值。还发现通过改变多体参数可以容易地控制MDPD流体在固体壁上的润湿能力。对于静止的液膜情况，通过使用Ohnesorge数来确定MDPD缩减单元与实际单元之间的特征长度。原创性/价值-当前的参数研究表明，通过仔细控制MDPD参数，MDPD方法中的液体性质可能会发生变化，这证明了该方法在各种实际流体中的潜在应用潜力。这将有助于研究纳米和亚微米级的多相传输现象，例如燃料电池，电池和其他涉及多孔介质的工程设备。

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