Comprehensive verification and validation of a CFD analysis
Comprehensive verification and validation of a CFD analysis
Wave energy converters (WECs) are designed to operate near the resonance region, being excited at or close to its natural frequencies. Therefore, they are strongly affected by the interaction with waves, motion and mooring restraints. Floating WECs, such as point absorbers, present small dimensions in relation to the wave length, being typically subjected to large amplitude motions. An oscillating floating vertical cylinder is a simple representative geometry of WECs and component of many different floating structures. Over the past years it has been addressed in multiple studies revealing several difficulties.
The pitch and heave free decay responses of a floating vertical cylinder will be studied throughout this paper. The present case was based on an experiment and subject of different CFD validation studies. Both have found significant discrepancies regarding the damping and natural period of the system, specially for the pitch motion. Throughout this work a rigorous verification study was performed, with special focus on the iterative convergence and discretisation errors relative to the hydrodynamic damping coefficients. Moreover, the main phenomena contributing to the hydrodynamic damping of the system were identified. Furthermore, the results were further compared with an experimental investigation.
Wave Energy Converte, Computational Fluid Dynamics, Decay test, ReFRESCO, Hydrodynamic Damping
Amaral, Tiago
c694569c-91fd-4a7f-a02e-3a0584164e3b
Rentschler, Manuel
704aeaf0-62e4-47e1-ba8b-041a74fe1624
Vasconcelos Beleza Vaz, Guilherme
5da9ae02-ecc3-42f7-bdf2-003f27f899fd
Baltazar, Joao
685182ed-06d2-47d3-947d-79eae81507e7
Amaral, Tiago
c694569c-91fd-4a7f-a02e-3a0584164e3b
Rentschler, Manuel
704aeaf0-62e4-47e1-ba8b-041a74fe1624
Vasconcelos Beleza Vaz, Guilherme
5da9ae02-ecc3-42f7-bdf2-003f27f899fd
Baltazar, Joao
685182ed-06d2-47d3-947d-79eae81507e7
Amaral, Tiago, Rentschler, Manuel, Vasconcelos Beleza Vaz, Guilherme and Baltazar, Joao
(2022)
Comprehensive verification and validation of a CFD analysis.
In Proc. ASME. OMAE2022: Ocean Renewable Energy.
vol. Vol. 8,
12 pp
.
(doi:10.1115/OMAE2022-80578).
Record type:
Conference or Workshop Item
(Paper)
Abstract
Wave energy converters (WECs) are designed to operate near the resonance region, being excited at or close to its natural frequencies. Therefore, they are strongly affected by the interaction with waves, motion and mooring restraints. Floating WECs, such as point absorbers, present small dimensions in relation to the wave length, being typically subjected to large amplitude motions. An oscillating floating vertical cylinder is a simple representative geometry of WECs and component of many different floating structures. Over the past years it has been addressed in multiple studies revealing several difficulties.
The pitch and heave free decay responses of a floating vertical cylinder will be studied throughout this paper. The present case was based on an experiment and subject of different CFD validation studies. Both have found significant discrepancies regarding the damping and natural period of the system, specially for the pitch motion. Throughout this work a rigorous verification study was performed, with special focus on the iterative convergence and discretisation errors relative to the hydrodynamic damping coefficients. Moreover, the main phenomena contributing to the hydrodynamic damping of the system were identified. Furthermore, the results were further compared with an experimental investigation.
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2022-OMAE-80578_Amaral_el_al_V&V-FoatingWind.pdf
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e-pub ahead of print date: 17 October 2022
Additional Information:
Paper No: OMAE2022-80578
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Venue - Dates:
ASME 2022 41st International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2022, , Hamburg, Germany, 2022-06-05 - 2022-06-10
Keywords:
Wave Energy Converte, Computational Fluid Dynamics, Decay test, ReFRESCO, Hydrodynamic Damping
Identifiers
Local EPrints ID: 475419
URI: http://eprints.soton.ac.uk/id/eprint/475419
PURE UUID: 64353567-516a-4074-998a-5fca7a030436
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Date deposited: 17 Mar 2023 17:37
Last modified: 17 Mar 2024 01:25
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Contributors
Author:
Tiago Amaral
Author:
Manuel Rentschler
Author:
Guilherme Vasconcelos Beleza Vaz
Author:
Joao Baltazar
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