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

  • Authors:

  • ísmund Ervik;Karl Yngve Lervåg;Svend Tollak Munkejord

  • Affiliations:

  • SINTEF Energy Research, P.O. Box 4761 Sluppen, NO-7465 Trondheim, Norway and NTNU, Department of Energy and Process Engineering, Kolbjørn Hejes v 1B, NO-7491 Trondheim, Norway;NTNU, Department of Energy and Process Engineering, Kolbjørn Hejes v 1B, NO-7491 Trondheim, Norway;SINTEF Energy Research, P.O. Box 4761 Sluppen, NO-7465 Trondheim, Norway

  • Venue:
  • Journal of Computational Physics
  • Year:
  • 2014

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Abstract

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.