Modeling of a Semisubmersible Floating Offshore Wind Platform in Severe WavesSource: Journal of Offshore Mechanics and Arctic Engineering:;2019:;volume( 141 ):;issue: 006::page 61905Author:Rivera-Arreba, Irene
,
Bruinsma, Niek
,
Bachynski, Erin E.
,
Viré, Axelle
,
Paulsen, Bo T.
,
Jacobsen, Niels G.
DOI: 10.1115/1.4043942Publisher: American Society of Mechanical Engineers (ASME)
Abstract: Floating offshore wind platforms may be subjected to severe sea states, which include both steep and long waves. The hydrodynamic models used in the offshore industry are typically based on potential-flow theory and/or Morison’s equation. These methods are computationally efficient and can be applied in global dynamic analysis considering wind loads and mooring system dynamics. However, they may not capture important nonlinearities in extreme situations. The present work compares a fully nonlinear numerical wave tank (NWT), based on the viscous Navier–Stokes equations, and a second-order potential-flow model for such situations. A comparison of the NWT performance with the experimental data is first completed for a moored vertical floating cylinder. The OC5-semisubmersible floating platform is then modeled numerically both in this nonlinear NWT and using a second-order potential-flow based solver. To test both models, they are subjected to nonsteep waves and the response in heave and pitch is compared with the experimental data. More extreme conditions are examined with both models. Their comparison shows that if the structure is excited at its heave natural frequency, the dependence of the response in heave on the wave height and the viscous effects cannot be captured by the adjusted potential-flow based model. However, closer to the inertia dominated region, the two models yield similar responses in pitch and heave.
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contributor author | Rivera-Arreba, Irene | |
contributor author | Bruinsma, Niek | |
contributor author | Bachynski, Erin E. | |
contributor author | Viré, Axelle | |
contributor author | Paulsen, Bo T. | |
contributor author | Jacobsen, Niels G. | |
date accessioned | 2019-09-18T09:02:42Z | |
date available | 2019-09-18T09:02:42Z | |
date copyright | 6/26/2019 12:00:00 AM | |
date issued | 2019 | |
identifier issn | 0892-7219 | |
identifier other | omae_141_6_061905 | |
identifier uri | http://yetl.yabesh.ir/yetl1/handle/yetl/4258207 | |
description abstract | Floating offshore wind platforms may be subjected to severe sea states, which include both steep and long waves. The hydrodynamic models used in the offshore industry are typically based on potential-flow theory and/or Morison’s equation. These methods are computationally efficient and can be applied in global dynamic analysis considering wind loads and mooring system dynamics. However, they may not capture important nonlinearities in extreme situations. The present work compares a fully nonlinear numerical wave tank (NWT), based on the viscous Navier–Stokes equations, and a second-order potential-flow model for such situations. A comparison of the NWT performance with the experimental data is first completed for a moored vertical floating cylinder. The OC5-semisubmersible floating platform is then modeled numerically both in this nonlinear NWT and using a second-order potential-flow based solver. To test both models, they are subjected to nonsteep waves and the response in heave and pitch is compared with the experimental data. More extreme conditions are examined with both models. Their comparison shows that if the structure is excited at its heave natural frequency, the dependence of the response in heave on the wave height and the viscous effects cannot be captured by the adjusted potential-flow based model. However, closer to the inertia dominated region, the two models yield similar responses in pitch and heave. | |
publisher | American Society of Mechanical Engineers (ASME) | |
title | Modeling of a Semisubmersible Floating Offshore Wind Platform in Severe Waves | |
type | Journal Paper | |
journal volume | 141 | |
journal issue | 6 | |
journal title | Journal of Offshore Mechanics and Arctic Engineering | |
identifier doi | 10.1115/1.4043942 | |
journal fristpage | 61905 | |
journal lastpage | 061905-11 | |
tree | Journal of Offshore Mechanics and Arctic Engineering:;2019:;volume( 141 ):;issue: 006 | |
contenttype | Fulltext |