Crespo, A.J.C

Quartier, Nicolas

Stratigaki, Vicky

Troch, Peter

Vervaet, Timothy

English

Ghent University Academic Bibliography

WAVE ENERGY CONVERTER MODELLING IN DUALSPHYSICSDEPARTMENT OF CIVIL ENGINEERING, GHENT UNIVERSITY, GHENT, BELGIUM1,EPHYSLAB ENVIRONMENTAL PHYSICS LABORATORY, UNIVERSIDADE DE VIGO, OURENSE, SPAIN2Timothy Vervaet1, Nicolas Quartier1, Vasiliki Stratigaki1, Peter Troch1, Alejandro J. C. Crespo2Contact: timothy.vervaet@ugent.benicolas.quartier@ugent.be awww.ugent.beReferences[1] Crespo et al., (2015), “DualSPHysics: Open-source parallel CFD solver based on Smoothed Particle Hydrodynamics (SPH)”, Computer Physics Communications no. 187: 204-216[2] Canelas et al., (2018), “Extending DualSPHysics with a Differential Variational Inequality: modeling fluid-mechanism interaction”, Applied Ocean Research no. 76: 88-97[3] Domínguez, José M., A. J.C. Crespo, M. Hall, C. Altomare, M. Wu, V. Stratigaki, P. Troch, L. Cappietti, and M. Gómez-Gesteira, (2019), “SPH Simulation of Floating Structures with Moorings.” Coastal Engineering, no. 153: 1–15.Fig. 2: Paraview visualization of wave velocities (in the wave propagation direction) of a heaving cylinder simulated in regular waves in DualSPHysicsBackground on Smoothed Particle Hydrodynamics – DualSPHysics• Discretization of domain in a set of Lagrangian points, or particles.• Approximation of a generic function F at position ra :F ra ≈෍bF rb .mbρbW(ra − rb, h)• Summation over all neighboring particles b that fall within the support ofthe Kernel, defined by the smoothing length h.• W is defined as the Kernel function, usually cubic or quintic..• Momentum conservation equation in SPH:dvadt= −෍bmbPb + Paρb. ρa+ Пab 𝛻aWab + g• Continuity equation in SPH:dρadt=෍bmbvab. 𝛻aWabResults from advanced simulations in DualSPHysicsThe coupling between DualSPHysics and Project Chrono [2] allows the addition ofmechanical constraints (hinges, springs, joints, etc.) to the domain, which can be used tostudy Power Take-Off systems of WECs. Figure 3 shows the connection of a floating box tothe seabed with a linear spring, modelled in 2D in DualSPHysics.The DualSPHysics-MoorDyn coupling [3] allows the addition of mooring lines to the domain,which can be used to study mooring configurations of WECs. The coupling was used tocompare numerical results with experimental results of a moored floating box, connectedto the seabed with 4 mooring lines [3]. Figure 4 shows this numerical set-up.AcknowledgementsThe work presented was performed by Timothy Vervaet and Nicolas Quartier during aWECANet COST Action CA17105 Short Term Scientific Mission from 25/02/2019 to 17/03/2019at the EPhysLab in Ourense. Timothy Vervaet and Nicolas Quartier would like toacknowledge their PhD Aspirant Research Fellowship (11A6919N) and PhD Strategic BasicResearch (3G029114) by the Research Foundation Flanders, Belgium (FWO), respectively.Objectives and methodologyThe main objectives of the WECANet COST Action CA17105 Short Term Scientific Mission were to acquire the skills to perform:Basic simulations of Wave Energy Converters (WECs) in DualSPHysics:• Standard WEC geometries and regular wave conditions.• Wave tank/basin with attention to wave generation, propagation, reflection andabsorption (passive and active).• Post-processing tools for representation of motion data of floating objects, data ofwater surface elevation and data of acting forces.Advanced simulations of WECs in DualSPHysics:• User-defined WEC-geometries.• Inlet/outlet open boundary conditions.• Coupling with Project Chrono: Allows modelling of mechanical constraints, which isuseful for PTO system modelling [2].• Coupling with Moordyn: Allows simulation of moored floating structures, with definedmooring characteristics [3].Fig. 3: Floating box connected to the seabed with a linear spring.ConclusionThe coupling with Chrono and MoorDyn proved to be applicable to model WECs with a PTOand mooring configuration, respectively. The conducted STSM provided the applicants anintensive training in DualSPHysics, which allows them to apply this numerical tool on theirown wave energy converter research cases.Fig. 1: Kernel function W with smoothing length hGeneral Assembly 2019 of the WECANet COST Action CA17105Porto, Portugal | November 28-29, 2019Funded by the Horizon 2020 Framework Programmeof the European UnionResults from basic simulations in DualSPHysicsSimulations were performed with a heaving cylinder in regular waves. Figure 2 shows aParaview visualization of this test case.www.cost.eu www.wecanet.euFig. 4: Numerical set-up of the floating box moored with four lines [3]

Wave energy converter modelling in dualSPHysics

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Wave energy converter modelling in dualSPHysics

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Ghent University Academic Bibliography