Virtual wave flume and Oscillating Water Column modeled by lattice Boltzmann method and comparison with experimental data

Thorimbert, Yann; Lätt, Jonas; Cappietti, Lorenzo; Chopard, Bastien

doi:10.1016/j.ijome.2016.04.001

Cited by 24 publications

(9 citation statements)

References 26 publications

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“…Similar to the VOF approach in literature [20][21][22][23][24]32,33) , interface tracking is made by computing the fluxes between cell. For interface cells, a direct calculation of the mass exchange is made from the stream step of the LBM.…”

Section: Free Surface-tracking Techniquementioning

confidence: 99%

See 1 more Smart Citation

Lattice Boltzmann Method for Free Surface Impacting on Vertical Cylinder : A Comparison with Experimental Data

Mohd¹,

Kamra²,

Sueyoshi³

et al. 2017

Evergreen

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The purpose of the present research is to study three-dimensional lattice Boltzmann method (LBM) simulation on free surface impact phenomena with the validation on a newly performed dam breaking experiment. Large eddy simulation (LES) is implemented in the LBM to enhance the computational efficiency and to relax the restriction of the computational stability. The LBM method involves a surface-tracking technique with free surface algorithm. In this study, the present numerical simulation is validated by comparing wave front propagation and water level elevation with the experimental measurements. A three dimensional numerical simulation on dam breaking with vertical cylinder obstacles are performed and qualitative comparison with the experimental measurement has been made. Good qualitative agreement between numerical simulations and the experiments has been obtained in terms of free surface development, splash pattern and splash distance. For the square cross section cylinder, the water impacts on the cylinder violently and the flow is directed to the sides of the tank. For the circular cross section cylinder, the water flows smoothly around the cylinder and impacts tank wall violently. The results show that the free surface lattice Boltzmann method is efficient for dealing with complex geometrical problems.

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Section: Free Surface-tracking Techniquementioning

confidence: 99%

“…The Smagorinsky model which determines the strain rate tensor with Smagorinsky constant and strain rate tensor through an additional turbulent viscosity can be computed locally by the LBM. For more details on the LBM implementation of the Smagorinsky LES model, the reader is referred to articles 24,32,33,35)…”

Section: Smagorinsky Large Eddy Simulation (Les)mentioning

confidence: 99%

Lattice Boltzmann Method for Free Surface Impacting on Vertical Cylinder : A Comparison with Experimental Data

Mohd¹,

Kamra²,

Sueyoshi³

et al. 2017

Evergreen

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“…The first one is a floating closed box (referred to as "BOX" hereafter), and the second one is the model of a generic floating "OWC WEC." The geometry of the OWC WEC tested during this study corresponds closely to that of the fixed OWC WEC previously studied at LABIMA-WCF, both experimentally and numerically ( [11,19,21]).…”

Section: Floating Bodies Of the Tested Box And Owc Wec Scale Modelsmentioning

confidence: 75%

“…A preliminary test with a 1:25 scaled (Froude Scale) floating OWC WEC model was conducted in the large wave flume of Ghent University (GGG-UGent) in Belgium [18] in preparation of the EU EsflOWC MaRINET2 tests that were later conducted at LABIMA of the University of Florence. In both mentioned works, the OWC model that had already been studied in fixed conditions, experimentally and numerically, by [19,20] was tested in the floating conditions. The primary purpose of the tests conducted at the Ghent University was to assess the OWC WEC response and mooring line tensions using two types of mooring materials, including nylon rope and an iron chain.…”

Section: Introductionmentioning

confidence: 99%

Efficiency and Survivability of a Floating Oscillating Water Column Wave Energy Converter Moored to the Seabed: An Overview of the EsflOWC MaRINET2 Database

Kisacik

Stratigaki

et al. 2020

Water

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Floating oscillating water column (OWC) type wave energy converters (WECs), compared to fixed OWC WECs that are installed near the coastline, can be more effective as they are subject to offshore waves before the occurrence of wave dissipation at a nearshore location. The performance of floating OWC WECs has been widely studied using both numerical and experimental methods. However, due to the complexity of fluid–structure interaction of floating OWC WECs, most of the available studies focus on 2D problems with WEC models of limited degrees-of-freedom (DOF) of motion, while 3D mooring effects and multiple-DOF OWC WECs have not been extensively investigated yet under 2D and 3D wave conditions. Therefore, in order to gain a deeper insight into these problems, the present study focuses on wave flume experiments to investigate the motion and mooring performance of a scaled floating OWC WEC model under 2D wave conditions. As a preparatory phase for the present MaRINET2 EsflOWC (efficiency and survivability of floating OWC) project completed at the end of 2017, experiments were also carried out in advance in the large wave flume of Ghent University. The following data were obtained during these experimental campaigns: multiple-DOF OWC WEC motions, mooring line tensions, free surface elevations throughout the wave flume, close to and inside the OWC WEC, change in the air pressure inside the OWC WEC chamber and velocity of the airflow through the vent on top of the model. The tested wave conditions mostly include nonlinear intermediate regular waves. The data obtained at the wave flume of Ghent University, together with the data from the EsflOWC tests at the wave flume of LABIMA, University of Florence, provide a database for numerical validation of research on floating OWC WECs and floating OWC WEC farms or arrays used by researchers worldwide.

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“…The performance of a single unit fixed OWC WEC is investigated by an experimental study carried out in the wave flume of the University of Florence (LABIMA) [24]. This laboratory scale model has also served as a benchmark test case for the assessment of CFD approaches such as that based on the Lattice Boltzmann Method [25] and the OpenFOAM source code [26]. Moreover, Simonetti et al [27] have discussed, by means of numerical investigations, the optimization of the main geometric characteristics and the PTO damping.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of a Moored Floating Oscillating Water Column Wave-Energy Converter and of a Moored Cubic Box

Stratigaki

Troch

et al. 2019

Energies

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This paper describes experimental research on a floating moored Oscillating Water Column (OWC)-type Wave-Energy Converter (WEC) carried out in the wave flume of the Coastal Engineering Research Group of Ghent University. This research has been introduced to cover the existing data scarcity and knowledge gaps regarding response of moored floating OWC WECs. The obtained data will be available in the future for the validation of nonlinear numerical models. The experiment focuses on the assessment of the nonlinear motion and mooring-line response of a 1:25 floating moored OWC WEC model to regular waves. The OWC WEC model motion has 6 degrees of freedom and is limited by a symmetrical 4-point mooring system. The model is composed of a chamber with an orifice on top of it to simulate the power-take-off (PTO) system and the associated damping of the motion of the OWC WEC model. In the first place, the motion response in waves of the moored floating OWC WEC model is investigated and the water surface elevation in the OWC WEC chamber is measured. Secondly, two different mooring-line materials (iron chains and nylon ropes) are tested and the corresponding OWC WEC model motions and mooring-line tensions are measured. The performance of these two materials is similar in small-amplitude waves but different in large wave-amplitude conditions. Thirdly, the influence of different PTO conditions is investigated by varying the diameter of the top orifice of the OWC WEC model. The results show that the PTO damping does not affect the OWC WEC motion but has an impact on the water surface elevation inside the OWC chamber. In addition, an unbalanced mooring configuration is discussed. Finally, the obtained data for a moored cubic model in waves are presented, which is a benchmarking case for future validation purposes.

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Virtual wave flume and Oscillating Water Column modeled by lattice Boltzmann method and comparison with experimental data

Cited by 24 publications

References 26 publications

Lattice Boltzmann Method for Free Surface Impacting on Vertical Cylinder : A Comparison with Experimental Data

Lattice Boltzmann Method for Free Surface Impacting on Vertical Cylinder : A Comparison with Experimental Data

Efficiency and Survivability of a Floating Oscillating Water Column Wave Energy Converter Moored to the Seabed: An Overview of the EsflOWC MaRINET2 Database

Experimental Study of a Moored Floating Oscillating Water Column Wave-Energy Converter and of a Moored Cubic Box

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