A robust method for calculating interface curvature and normal vectors using an extracted local level set

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[1] [1,Ervik, Åsmund
[2] Lervåg, Karl Yngve
[3] Munkejord, Svend Tollak
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Ervik, Åsmund | 1600年 / Academic Press Inc.卷 / 257期
关键词
Curvature - Curvature vectors - Droplet-film interaction - Interface configuration - Interface curvatures - Level Set method - Normal vector - Robust methods - Topological changes - Two phases flow;
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摘要
The level-set method is a popular interface tracking method in two-phase flow simulations. An often-cited reason for using it is that the method naturally handles topological changes in the interface, e.g. merging drops, due to the implicit formulation. It is also said that the interface curvature and normal vectors are easily calculated. This last point is not, however, the case in the moments during a topological change, as several authors have already pointed out. Various methods have been employed to circumvent the problem. In this paper, we present a new such method which retains the implicit level-set representation of the surface and handles general interface configurations. It is demonstrated that the method extends easily to 3D. The method is validated on static interface configurations, and then applied to two-phase flow simulations where the method outperforms the standard method and the results agree well with experiments. © 2013 Elsevier Inc.
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