New instability and mixing simulations using SPH and a novel mixing measure
New instability and mixing simulations using SPH and a novel mixing measure
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DOI：
10.1007/s42241-020-0045-x
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发表时间：
2020-08
影响因子：
2.5
通讯作者：
Georgina Reece;B. Rogers;S. Lind;G. Fourtakas
中科院分区：
文献类型：
--
作者：
Georgina Reece;B. Rogers;S. Lind;G. Fourtakas
本文评估了光滑颗粒流体力学（SPH）在不同流型下模拟两相流混合及其向不稳定过渡的能力。本文还提出了一种量化拉格朗日框架中相间混合度的新方法。通过盖驱动腔体和两相泊泽维尔流的实验验证了该方法的有效性。将沿空腔中心的速度与文献结果进行了比较，而商用流体体积代码STAR-CCM+为混合提供了基准，并考虑了不同的混合措施。用微扰理论比较了两相泊泽维尔流沿通道的速度和界面不稳定性的出现。这是SPH首次用于研究这些不稳定性的发生和发展。特别是，它能够模拟界面的变形形状，这是分析研究无法给出的，同时也提供了比传统的基于网格的计算流体动力学模拟更好的预测。
This paper assesses the ability of smoothed particle hydrodynamics (SPH) to simulate mixing of two-phase flows and their transition to instabilities under different flow regimes. A new measure for quantification of the degree of mixing between phases in a Lagrangian framework is also developed. The method is validated using the lid-driven cavity and two-phase Poiseuille flow cases. The velocity along the centre of the cavity is compared with results from the literature, whilst commercial volume-of-fluid code STAR-CCM+ provides a benchmark for the mixing and different mixing measures are considered. The velocity of two-phase Poiseuille flow along the channel is compared to the analytical solution, and the appearance of interfacial instabilities with perturbation theory. This is the first time SPH has been used to investigate the onset and development of these instabilities. In particular, it is able to model the deforming shape of the interface, which is not given by analytical studies, while also offering improved predictions over conventional mesh-based computational fluid dynamics simulations.