Performance of interFoam on the simulation of progressive waves

Bjarke Eltard Larsen*, David R. Fuhrman, Johan Roenby

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

The performance of interFoam (a widely used solver within OpenFOAM®) in simulating the propagation of a nonlinear (stream function solution) regular wave is investigated in this work. It is demonstrated that over time there is a tendency for surface elevations to increase, wiggles to appear in the free surface, and crest velocities to become (severely) overestimated. It is shown that increasing the temporal and spatial resolution can mitigate these undesirable effects, but that a relatively small Courant number is required and fine discretization is needed, indicating that many past simulations have not converged. It is further demonstrated that discretization schemes and solver settings (often treated as a “black box” by users) can have a major impact on the results. This impact is documented, and it is shown that obtaining a “diffusive balance” is crucial to accurately propagate a surface wave over long distances without requiring exceedingly high temporal and spatial resolutions. Finally, the new code isoAdvector is demonstrated to produce comparably accurate results to interFoam, while maintaining a sharper surface. It is hoped that the present study will raise awareness of potential shortcomings of interFoam and enable a more accurate and optimal use, in CFD simulation of free surface waves.
Original languageEnglish
JournalCoastal Engineering Journal
Volume61
Issue number3
Pages (from-to)380-400
ISSN0578-5634
DOIs
Publication statusPublished - 2019

Keywords

  • InterFoam
  • Waves
  • Discretization practises
  • IsoAdvector

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