VALIDATION OF A BUOYANCY-MODIFIED TURBULENCE MODEL BY NUMERICAL SIMULATIONS OF BREAKING WAVES OVER A FIXED BAR

  • Brecht Devolder
  • Peter Troch
  • Pieter Rauwoens

Abstract

The surf zone dynamics are governed by important processes such as turbulence generation , nearshore sediment transport , wave run-up and wave overtopping at a coastal structure. During field observations , it is very challenging to measure and quantify wave breaking turbulence . Complementary to experimental laboratory studies in a more controlled environment , numerical simulations are highly suitable to understand and quantify surf zone processes more accurately. In this study, wave propagation and wave breaking over a fixed barred beach profile is investigated using a two­ phase Navier-Stokes flow solver. We show that accurate predictions of the turbulent two-phase flow field require special attention regarding turbulence modelling. The numerical wave flume is implemented in the open­ source OpenFOAM library. The computed results (surface elevations , velocity profiles and turbulence levels) are compared against experimental measurements in a wave flume (van der A et al., 2017) .

References

Devolder, Rauwoens, Troch (2017) : Application of a buoyancy-modified k-w SSTturbulence model to simulate wave run-up around a monopile subjected to regular waves using OpenFOAM®, Coastal Engineering, ELSEVIER, vol. 125, pp. 81-94 .

Devolder, Troch, Rauwoens (2018): Performance of a buoyancy-modified k-w and k-w SSTturbulence model for simulating wave breaking under regular waves using OpenFOAM®, Coastal Engineering , ELSEVIER , vol. 138, pp. 49-65 .

van der A, van der Zanden, O'Donoghue , Hurther, Caceres, Mclelland, Ribberink (2017): Large-scale laboratory study of breaking wave hydrodynamics over a fixed bar, Journal of Geophysical Research: Oceans , JOHN WILEY & SONS, vol. 122, pp. 3287-3310 .

Published
2018-12-30
How to Cite
Devolder, B., Troch, P., & Rauwoens, P. (2018). VALIDATION OF A BUOYANCY-MODIFIED TURBULENCE MODEL BY NUMERICAL SIMULATIONS OF BREAKING WAVES OVER A FIXED BAR. Coastal Engineering Proceedings, 1(36), waves.71. https://doi.org/10.9753/icce.v36.waves.71

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