A weighted particle scheme for Enskog-Vlasov equation to simulate spherical nano-droplets/bubbles

A weighted particle scheme for Enskog-Vlasov equation to simulate spherical nano-droplets/bubbles
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Enskog-Vlasov 方程的加权粒子方案模拟球形纳米液滴/气泡

DOI:
10.1016/j.jcp.2022.111873
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发表时间:
2023
影响因子:
4.1
通讯作者:
Busuioc S
Busuioc S
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Busuioc S

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Enskog-Vlasov方程已被证明成功地捕捉了经历相变的流体的复杂行为。然而,它的数值解是计算上的要求,这限制了一维和二维平面流动的研究。在这项工作中,一个加权粒子计划的数值解Enskog-Vlasov方程球对称几何。它示出了如何加权计划设计的玻尔兹曼方程可以扩展到科普的非局部结构的Enskog碰撞积分,并确定使用壳定理的平均力场的一个紧凑的表达式。作为一个应用程序,纳米液滴/气泡的生长速率在一个均匀的亚稳态蒸气/液体的体积中进行评估,在很宽的范围内的过饱和比,这是不可能的,直到现在,由于高计算成本所需的替代方法。所提出的方案显着拓宽了可以通过Enskog-Vlasov方程进行研究的问题的范围,并且它是对一般三维液体-蒸汽流的模拟的垫脚石。
The Enskog-Vlasov equation has been proven successful in capturing the complex behaviour of fluids undergoing a phase change. However, its numerical solution is computationally demanding, and this has restricted the studies to one- and two-dimensional planar flows. In this work, a weighted particle scheme is developed for the numerical solution of the Enskog–Vlasov equation in spherically symmetric geometry. It is shown how weighted schemes designed for the Boltzmann equation can be extended to cope with the non-local structure of the Enskog collision integral, and a compact expression of the mean force field is determined using the shell theorem. As an application, the growth rates of nano-droplets/bubbles in the bulk of a homogeneous metastable vapour/liquid are evaluated in a wide range of supersaturation ratios that was not possible until now due to the high computational cost required by alternate approaches. The proposed scheme significantly broadens the range of problems that can be investigated via the Enskog-Vlasov equation, and it is a stepping stone towards the simulation of general three-dimensional liquid-vapour flows.
DOI: 10.1063/1.2186327
发表时间: 2006-04
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DOI: 10.1299/mer.16-00540
发表时间: 2017
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