Simulation of Breaking Waves in the Surf Zone using a Navier-Stokes Solver

Mayer, Stefan; Madsen, Peter Hauge

doi:10.1061/40549(276)72

Cited by 34 publications

(70 citation statements)

References 6 publications

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“…This unphysical wave damping caused by RANS turbulence modelling is not only observed during CFD simulations of monopiles. Several other authors also reported wave damping when using CFD for wave modelling: Mayer and Madsen (2000), Jacobsen et al (2012), Vanneste and Troch (2015) and Elhanafi et al (n.d.).…”

Section: Introductionmentioning

confidence: 93%

Application of a buoyancy-modified k-ω SST turbulence model to simulate wave run-up around a monopile subjected to regular waves using OpenFOAM ®

Devolder

Rauwoens

Troch

2017

Coastal Engineering

136

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The objective of the present work is to investigate wave run-up around a monopile subjected to regular waves inside a numerical wave flume using the Computational Fluid Dynamics (CFD) toolbox OpenFOAM®. Reynolds-Averaged Navier-Stokes (RANS) turbulence modelling is performed by applying the k-ω SST model. Boundary conditions for wave generation and absorption are adopted from the IHFOAM toolbox. Simulations of propagating water waves show sometimes excessive wave damping (i.e. a significant decrease in wave height over the length of the numerical wave flume) based on RANS turbulence modelling. This anomaly is prevented by implementing a buoyancy term in the turbulent kinetic energy equation. The additional term suppresses the turbulence level at the interface between water and air. The proposed buoyancy-modified k-ω SST turbulence model results in an overall stable wave propagation model without significant wave damping over the length of the flume. Firstly, the necessity of a buoyancy-modified k-ω SST turbulence model is demonstrated for the case of propagating water waves in an empty wave flume. Secondly, numerical results of wave run-up around a monopile under regular waves using the buoyancy-modified k-ω SST turbulence model are validated by using experimental data measured in a wave flume by De Vos et al. (2007). Furthermore, timedependent high spatial resolutions of the numerically obtained wave run-up around the monopile are presented. These results are in line with the experimental data and available analytical formulations.

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Section: Introductionmentioning

confidence: 93%

Application of a buoyancy-modified k-ω SST turbulence model to simulate wave run-up around a monopile subjected to regular waves using OpenFOAM ®

Devolder

Rauwoens

Troch

2017

Coastal Engineering

136

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“…With developments of CFD (computational fluid dynamics) and increases in computer power, recent models for studying free surface flows, including breaking waves, solve the Navier-Stokes equations coupled with a free surface calculation (see Lin 2008 for comprehensive modelling applications and methodologies for water waves). There are several numerical studies on breaking waves in the surf zone based on one-phase flow model (Lin and Liu 1998a;1998b;Bradford 2000;Mayer and Madsen 2000;Zhao et al 2004;Shao 2006;Shao and Ji 2006;Bakhtyar et al 2009;Christensen and Deigaard 2001;Watanabe et al 2005), in which only the flow in the water is considered in the computation, the pressure in the air is taken as a constant, and the boundary conditions are specified at the free surface. When the wind is present, the pressure in the air is no longer a constant and the previously used boundary conditions are not valid at the interface.…”

Section: Introductionmentioning

confidence: 99%

Numerical modelling of wind effects on breaking waves in the surf zone

Xie

2017

Ocean Dynamics

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Wind effects on periodic breaking waves in the surf zone have been investigated in this study using a two-phase flow model. The model solves the Reynoldsaveraged Navier-Stokes equations with the k − turbulence model simultaneously for the flows both in the air and water. Both spilling and plunging breakers over a 1:35 sloping beach have been studied under the influence of wind, with a focus during wave breaking. Detailed information of the distribution of wave amplitudes and mean water level, wave-height-to-water-depth ratio, the water surface profiles, velocity, vorticity, and turbulence fields have been presented and discussed. The inclusion of wind alters the air flow structure above water waves, increases the generation of vorticity, and affects the wave shoaling, breaking, overturning, and splash-up processes. Wind increases the water particle velocities and causes water waves to break earlier and seaward, which agrees with the previous experiment.Keywords Breaking waves · Wind-wave interaction · Surf zone · Two-phase flow model · Reynolds-averaged Navier-Stokes (RANS) equations · Volume of fluid method Responsible Editor: Eric Deleersnijder

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“…Along with including density, Jacobsen et al (2012) modified the k − ω model, following Mayer and Madsen (2000), by changing the production term, P k , in equation (5) to depend on the mean vorticity rather than the mean rate of strain of the flow. This was done in order to prevent any generation of TKE prior to breaking.…”

Section: Comparison With Numerical Investigationsmentioning

confidence: 99%

An Evaluation of Rans Turbulence Closure Models for Spilling Breakers

Brown

Magar²,

Greaves

et al. 2014

Int. Conf. Coastal. Eng.

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1Breaking waves generate turbulence which, along with the bottom stress, undertow, and other mean currents, is capable of suspending and transporting large quantities of sediment. In the present work, open source computational fluid dynamics software is utilised to evaluate four different turbulence models for the application of spilling breakers in the surf zone. The turbulence models are compared against both existing laboratory data and previous numerical models for surface elevation, velocity and turbulent kinetic energy profiles. The results imply that the different models vary in performance for each of these properties and that for incompressible, multiphase flows, it is important to include density explicitly in the turbulence transport equations. Overall, it was found that, out of the models considered, the best one for spilling breakers is the nonlinear k − ǫ model.

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Simulation of Breaking Waves in the Surf Zone using a Navier-Stokes Solver

Cited by 34 publications

References 6 publications

Application of a buoyancy-modified k-ω SST turbulence model to simulate wave run-up around a monopile subjected to regular waves using OpenFOAM ®

Application of a buoyancy-modified k-ω SST turbulence model to simulate wave run-up around a monopile subjected to regular waves using OpenFOAM ®

Numerical modelling of wind effects on breaking waves in the surf zone

An Evaluation of Rans Turbulence Closure Models for Spilling Breakers

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