A small-scale decomposition for 3D boundary integral computations with surface tension

David M. Ambrose, Michael Siegel, Svetlana Tlupova

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13 Scopus citations

Abstract

An efficient, non-stiff boundary integral method for the initial value problem for interfacial Darcy flow (which is a model of porous media flow) in three space dimensions is presented. We consider a 'doubly-periodic' interface separating two fluids, with surface tension present at the boundary. Surface tension introduces high order (i.e., high derivative) terms in the governing equation, and this imposes a severe stability constraint on explicit time-integration methods. Furthermore, the high order terms appear in a nonlocal operator, which makes it difficult to design an efficient implicit method. The stiffness is removed by developing a small-scale decomposition in the spirit of prior work in the two-dimensional problem by Hou, Lowengrub, and Shelley. In order to develop this small-scale decomposition, we formulate the problem using a generalized isothermal parameterization of the free surface. An additional difficulty is the efficient calculation of the Birkhoff-Rott integral for the velocity of the interface. We present a new algorithm, based on Ewald summation, to compute this in O(Nlog. N) operations, where N is the number of interface grid points. Our non-stiff method is expected to apply widely to problems for doubly-periodic interfacial flow with surface tension which have a boundary integral formulation.

Original languageEnglish (US)
Pages (from-to)168-191
Number of pages24
JournalJournal of Computational Physics
Volume247
DOIs
StatePublished - Aug 5 2013

All Science Journal Classification (ASJC) codes

  • Numerical Analysis
  • Modeling and Simulation
  • Physics and Astronomy (miscellaneous)
  • Physics and Astronomy(all)
  • Computer Science Applications
  • Computational Mathematics
  • Applied Mathematics

Keywords

  • Boundary integral method
  • Ewald summation
  • Interfacial flow
  • Surface tension

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