A wave generation toolbox for the open‐source CFD library: OpenFoam®

Jacobsen, Niels Gjøl; Fuhrman, David R.; Fredsøe, Jørgen

doi:10.1002/fld.2726

Cited by 853 publications

(603 citation statements)

References 39 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

128

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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

128

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“…OpenFOAM has been used to simulate coastal processes (Jacobsen et al 2012) (Higuera et al 2013), WEC operation (Palm et al 2013) (Schmitt et al 2012), (Iturrioz et al 2013) and extreme events (Vyzikas et al 2013). It has been used in NWT applications for hydrodynamic parameter identication (Bonfiglio et al 2011) (Armesto et al 2014).…”

Section: Openfoammentioning

confidence: 99%

Numerical wave tank identification of nonlinear discrete time hydrodynamic models

Davidson¹,

Giorgi²,

Ringwood³

2015

Renewable Energies Offshore

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Hydrodynamic models are important for the design, simulation and control of wave energy converters (WECs). Linear hydrodynamic models have formed the basis for this and have been well verified and validated over operating conditions for which small amplitude assumptions apply. At larger amplitudes a number of nonlinear effects may appear. One of these effects is due to the changing bouyancy force as the body moves in and out of the water. In this paper we look at identifying a nonlinear static block to be added the linear hydrodynamic model to account for this effect. The parameters for this nonlinear block are identified from WEC experiments simulated in a numerical wave tank (NWT). The parameters for the linear hydrodynamic model are also identified from NWT experiments. Here we explore the use of a discrete time linear hydrodynamic model which is well suited to the identification procedure.

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“…Also, removing reflection at outlet boundaries via a boundary condition works well only when the wave-length and speed of propagation is known. For those reasons, a relaxation zone approach is preferred [25], where the CFD solution is blended with the prescribed "far field" wave state within a relaxation zone.…”

Section: Waves and Relaxation Zonesmentioning

confidence: 99%

CFD Analysis in Subsea and Marine Technology

Jasak

2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. Computational Fluid Dynamics (CFD) is established in design and analysis for a range of industries, but its use in Marine and Naval Hydrodynamics is behind the trend. This can be attributed to the complexity of modelling needs, including presence of free surface, irregular transient flows, fluid-structure coupling and presence of established modelling tools based on potential theory.In this paper, state-of-the-art of CFD in Naval Hydrodynamics, wave and offshore applications is given, with an update of recent advances, validation and computing requirements for typical simulation cases. IntroductionSince the beginning of the 21st century, Computational Fluid Dynamics (CFD) has become well established across the range of engineering applications. CFD results are well understood, expectations on accuracy in design studies can be satisfied. For example, automotive industry uses CFD to significantly reduce the use of experimental studies in aerodynamics, internal combustion engine design and exhaust gas after-treatment. Indeed, CFD studies are now regularly performed in applications which were never properly analysed experimentally, such as passenger compartment comfort, vehicle soiling and acoustics-related phenomena, where the design primarily relies on CFD results.Acceptance of CFD in marine engineering, naval hydrodynamics and evaluation of wave loads appears to be lagging behind the trend of other industries. This is partially due to the complexity of free surface flows, but mainly by the fact that the phenomena under consideration imply significantly higher computational requirements. For example, sea-keeping studies of ships in irregular waves or calculation of transfer functions for wave loading on floating structures still cannot be performed at acceptable speed. "Engineering time-scale" in product design requires turn-over time of 8-12 hours for simulations to be practically useful.An important factor in the acceptance of CFD is the presence of alternative simulation tools. Numerical models based on potential flow theory are widely accepted, fast and validated and have been in use for more than a decade. The potential flow assumption, whole adequate for a part of industrial needs, brings it own limitations, mainly due to the formulation, or failure to account for coupled/non-linear effects. The best example is the evaluation of added resistance in waves, which may provide adequate loading results on the hull, but cannot account for forward speed of the ship.The challenges for CFD modelling in naval hydrodynamics can be grouped as follows:

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A wave generation toolbox for the open‐source CFD library: OpenFoam®

Cited by 853 publications

References 39 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 wave tank identification of nonlinear discrete time hydrodynamic models

CFD Analysis in Subsea and Marine Technology

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