A simple analytical model of complex wall in multibody dissipative particle dynamics
A simple analytical model of complex wall in multibody dissipative particle dynamics
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DOI：
10.1016/j.jcp.2019.06.075
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发表时间：
2019-11
期刊：
影响因子：
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通讯作者：
A. Mishra;A. Hemeda;M. Torabi;J. Palko;S. Goyal;D. Li;Yanbao Ma
中科院分区：
文献类型：
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作者：
A. Mishra;A. Hemeda;M. Torabi;J. Palko;S. Goyal;D. Li;Yanbao Ma
在多体耗散粒子动力学（MDPD）的背景下，一个封闭形式的数学表达式开发的解析模型的复杂壁。MDPD是耗散粒子动力学（DPD）的改进版本，是一种基于粒子的无网格方法。在DPD方法中，已经有几次尝试对固体壁和非周期性边界条件的影响进行分析建模。然而，这些边界条件与MDPD相关的研究数量有限，这些边界条件通过直接建模流体-固体颗粒相互作用来捕获静态和动态流体-结构相互作用。这项工作，第一次，采用了分析模型（积分方法）的固体壁边界条件MDPD带来了大量的增益计算效率，从而扩大了其适用范围弯曲或复杂的墙壁。此外，在目前的调查中使用的保守力的修正模型。该模型首先进行规范化，以解决润湿存在的差异，在本文献中，然后通过几个基准研究和测试用例，如Wenzel模型进行验证。此外，完全数值和半解析（积分力模型）的方法之间的比较。对模型的时间效率、精度、固壁附近的密度起伏以及模型的局限性进行了讨论。
In the context of multibody dissipative particle dynamics (MDPD), a closed-form mathematical expression is developed to analytically model a complex wall. MDPD is a modified version of dissipative particle dynamics (DPD), a particle-based mesh free method. There have been several attempts to analytically model the influence of solid walls and non-periodic boundary conditions in the DPD approach. However, there is a limited number of studies for these boundary conditions associated with MDPD that capture static and dynamic fluid-structure interactions through direct modeling of fluid-solid particle interactions. This work, for the first time, employs an analytical model (integral approach) for the solid wall boundary condition in MDPD that brings substantial gain in computational efficiency and thus expands the scope of its applicability to curved or complex walls. Furthermore, a modified model of conservative force is used in the current investigation. The model is first normalized to address the discrepancies in wetting that exist in the present literature and is then validated through several benchmark studies and test cases, such as a Wenzel model. Moreover, comparisons between both the fully numerical and the semi-analytical (integral force model) approaches are drawn. Time efficiency, accuracy, density fluctuation in vicinity of solid wall, and limitations of the proposed model are thoroughly discussed.