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Numerical prediction of wave excitation forces on a fixed tension leg platform concept for offshore wind turbines

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Khanam, S, Abdussamie, N ORCID: 0000-0002-8628-562X and Ojeda, R ORCID: 0000-0002-2421-0032 2019 , 'Numerical prediction of wave excitation forces on a fixed tension leg platform concept for offshore wind turbines', in G Macfarlane and G Colleter (eds.), Proceedings of Australasian Coasts & Ports Conference 2019 , Engineers Australia, Hobart, Australia, pp. 1-6 .

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Abstract

To predict wave excitation forces on a fixed Tension Leg Platform Wind Turbine (TLPWT), two numericalsoftware packages were used, namely the CFD code STAR-CCM+ and ANSYS AQWA. The CFD code solvedthe fully-nonlinear Navier-Stokes equations in a time domain whereas ANSYS AQWA solved the lineardiffraction problem in a frequency domain. In both domains, the horizontal wave excitation forces on a genericTLP structure under several deterministic regular wave conditions of a mild sea state were predicted. The sizeof the mesh/panel was fine-tuned to yield optimum results for both solvers. It was found that the horizontalforces obtained by the linear diffraction solver were larger in magnitude than CFD predictions. The lineardiffraction solver provided an insight into the horizontal force experienced by the TLP structure, and hence itcould be used to verify CFD results. However, as the linear diffraction theory does not account for the effectof turbulence, viscous effects or the effect of the air phase, CFD codes could be used to investigate suchphenomena and provide further details.

Item Type: Conference Publication
Authors/Creators:Khanam, S and Abdussamie, N and Ojeda, R
Keywords: offshore wind turbines, tension leg platforms, excitation forces, numerical predictions
Journal or Publication Title: Proceedings of Australasian Coasts & Ports Conference 2019
Publisher: Engineers Australia
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