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首页> 外文期刊>Journal of Computational Physics >Modeling merging and breakup in the moving mesh interface tracking method for multiphase flow simulations
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Modeling merging and breakup in the moving mesh interface tracking method for multiphase flow simulations

机译：多相流模拟中移动网格界面跟踪方法中的合并与分解建模

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The three-dimensional, moving mesh interface tracking (MMIT) method coupled with local mesh adaptations by Quan and Schmidt [S.P. Quan, D.P. Schmidt, A moving mesh inter-face tracking method for 3D incompressible two-phase flows, J. Comput. Phys. 221 (2007) 761 780] demonstrated the capability to accurately simulate multiphase flows, to handle large deformation, and also to perform interface pinch-off for some specific cases. However, another challenge, i.e. how to handle interface merging (such as droplet coalescence) has not been addressed. In this paper, we present a mesh combination scheme for inter-face connection and a more general mesh separation algorithm for interface breakup. These two schemes are based on the conversion of liquid cells in one phase to another fluid by changing the fluid properties of the cells in the combination or separation region. After the conversion, the newly created interface is usually ragged, and a local projection method is employed to smooth the interface. Extra mesh adaptation criteria are introduced to handle colliding interfaces with almost zero curvatures as the distance between the interfaces diminishes. Simulations of droplet pair collisions including both head-on and off-center coalescences show that the mesh adaptations are capable of resolving very small length scales, and the mesh combination and mesh separation schemes can handle the topological transitions in multiphase flows. The potential of our method to perform detailed investigations of droplet coalescence and breakup is also displayed. (C) 2008 Elsevier Inc. All rights reserved.
机译：三维移动网格界面跟踪（MMIT）方法与Quan和Schmidt [S.P. Quan D.P. Schmidt，一种用于3D不可压缩两相流的运动网格界面跟踪方法，J。Comput。物理221（2007）761 780]展示了能够精确模拟多相流，处理大变形以及在某些特定情况下执行界面收缩的功能。但是，还没有解决另一个挑战，即如何处理界面合并（例如液滴合并）。在本文中，我们提出了一种用于接口间连接的网格组合方案，以及一种用于接口分解的更通用的网格分离算法。这两种方案基于通过改变组合或分离区域中细胞的流体性质，将一相中的液体细胞转化为另一种流体。转换后，通常会破坏新创建的界面，并使用局部投影方法对界面进行平滑处理。当界面之间的距离减小时，引入了额外的网格自适应标准来处理几乎零曲率的碰撞界面。液滴对碰撞的仿真（包括正面和偏心合并）表明，网格自适应能够解决非常小的长度尺度，并且网格组合和网格分离方案可以处理多相流中的拓扑转换。还显示了我们的方法对液滴聚结和破裂进行详细研究的潜力。 （C）2008 Elsevier Inc.保留所有权利。

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