Performance of interFoam on the simulation of progressive waves

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

*Kontaktforfatter

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

3 Citationer (Scopus)

Resumé

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.

OriginalsprogEngelsk
TidsskriftCoastal Engineering Journal
Vol/bind61
Udgave nummer3
Sider (fra-til)380-400
Antal sider21
ISSN2166-4250
DOI
StatusUdgivet - 3 jul. 2019

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Surface Waves
Spatial Resolution
Free Surface
CFD Simulation
Surface waves
Regular Solution
Discretization Scheme
Stream Function
Black Box
Nonlinear Function
Simulation
Discretization
Propagation
Computational fluid dynamics
Awareness

Citer dette

Larsen, Bjarke Eltard ; Fuhrman, David R. ; Roenby, Johan. / Performance of interFoam on the simulation of progressive waves. I: Coastal Engineering Journal. 2019 ; Bind 61, Nr. 3. s. 380-400.
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Performance of interFoam on the simulation of progressive waves. / Larsen, Bjarke Eltard; Fuhrman, David R.; Roenby, Johan.

I: Coastal Engineering Journal, Bind 61, Nr. 3, 03.07.2019, s. 380-400.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

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T1 - Performance of interFoam on the simulation of progressive waves

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AU - Fuhrman, David R.

AU - Roenby, Johan

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AB - 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.

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