A cut-cell finite volume - finite element coupling approach for fluid-structure interaction in compressible flow

Vito Pasquariello, Georg Hammerl, Felix Örley, Stefan Hickel, Caroline Danowski, Alexander Popp, Wolfgang A. Wall, Nikolaus A. Adams

Research output: Contribution to journalArticlepeer-review

57 Scopus citations

Abstract

We present a loosely coupled approach for the solution of fluid-structure interaction problems between a compressible flow and a deformable structure. The method is based on staggered Dirichlet-Neumann partitioning. The interface motion in the Eulerian frame is accounted for by a conservative cut-cell Immersed Boundary method. The present approach enables sub-cell resolution by considering individual cut-elements within a single fluid cell, which guarantees an accurate representation of the time-varying solid interface. The cut-cell procedure inevitably leads to non-matching interfaces, demanding for a special treatment. A Mortar method is chosen in order to obtain a conservative and consistent load transfer. We validate our method by investigating two-dimensional test cases comprising a shock-loaded rigid cylinder and a deformable panel. Moreover, the aeroelastic instability of a thin plate structure is studied with a focus on the prediction of flutter onset. Finally, we propose a three-dimensional fluid-structure interaction test case of a flexible inflated thin shell interacting with a shock wave involving large and complex structural deformations.

Original languageEnglish
Pages (from-to)670-695
Number of pages26
JournalJournal of Computational Physics
Volume307
DOIs
StatePublished - 15 Feb 2016

Keywords

  • Compressible flow
  • Cut-cell method
  • Fluid-structure interaction
  • Immersed boundary method
  • Mortar method

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