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A hybrid particle volume-of-fluid method for curvature estimation in multiphase flows
International Journal of Multiphase Flow ( IF 3.8 ) Pub Date : 2020-04-01 , DOI: 10.1016/j.ijmultiphaseflow.2020.103209
Petr Karnakov , Sergey Litvinov , Petros Koumoutsakos

Abstract We present a particle method for estimating the curvature of interfaces in volume-of-fluid simulations of multiphase flows. The method is well suited for under-resolved interfaces, and it is shown to be more accurate than the parabolic fitting that is employed in such cases. The curvature is computed from the equilibrium positions of particles constrained to circular arcs and attracted to the interface. The proposed particle method is combined with the method of height functions at higher resolutions, and it is shown to outperform the current combinations of height functions and parabolic fitting. The algorithm is conceptually simple and straightforward to implement on new and existing software frameworks for multiphase flow simulations thus enhancing their capabilities in challenging flow problems. We evaluate the proposed hybrid method on a number of two- and three-dimensional benchmark flow problems and illustrate its capabilities on simulations of flows involving bubble coalescence and turbulent multiphase flows.

中文翻译:

一种用于多相流曲率估计的混合粒子体积流体方法

摘要 我们提出了一种用于估计多相流的流体体积模拟中界面曲率的粒子方法。该方法非常适合解析不足的界面,并且比在这种情况下使用的抛物线拟合更准确。曲率是根据被限制在圆弧上并被吸引到界面上的粒子的平衡位置计算出来的。所提出的粒子方法在更高分辨率下与高度函数方法相结合,并且表现出优于当前高度函数和抛物线拟合的组合。该算法在概念上简单直接,可以在用于多相流模拟的新的和现有的软件框架上实现,从而增强它们在具有挑战性的流动问题方面的能力。
更新日期:2020-04-01
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