Extreme wave impacts on monopiles: Re-analysis of experimental data by a coupled CFD solver
Two different numerical models, OceanWave3D and a coupled solver, OceanWave3D-OpenFOAM (Waves2Foam), are used to reproduce extreme events in one sea state. The events are chosen as, the measured event that generates the largest peak moment (exceedance probability of 0.05%) and one event with a sligh...
Published in: | Volume 1: Offshore Technology |
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American Society of Mechanical Engineers
2017
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Online Access: | https://orbit.dtu.dk/en/publications/edb1510c-c2b5-46fb-8e20-fdbde70229ad https://doi.org/10.1115/OMAE2017-61727 |
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ftdtupubl:oai:pure.atira.dk:publications/edb1510c-c2b5-46fb-8e20-fdbde70229ad 2023-05-15T14:23:16+02:00 Extreme wave impacts on monopiles: Re-analysis of experimental data by a coupled CFD solver Ghadirian, Amin Bredmose, Henrik Schløer, Signe Dixen, Martin 2017 https://orbit.dtu.dk/en/publications/edb1510c-c2b5-46fb-8e20-fdbde70229ad https://doi.org/10.1115/OMAE2017-61727 eng eng American Society of Mechanical Engineers info:eu-repo/semantics/closedAccess Ghadirian , A , Bredmose , H , Schløer , S & Dixen , M 2017 , Extreme wave impacts on monopiles: Re-analysis of experimental data by a coupled CFD solver . in Proceedings of ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering : Offshore Technology . vol. 1 , American Society of Mechanical Engineers , 36st International Conference on Ocean, Offshore, and Arctic Engineering (OMAE36) , Trondheim , Norway , 25/06/2017 . https://doi.org/10.1115/OMAE2017-61727 contributionToPeriodical 2017 ftdtupubl https://doi.org/10.1115/OMAE2017-61727 2023-01-05T00:08:00Z Two different numerical models, OceanWave3D and a coupled solver, OceanWave3D-OpenFOAM (Waves2Foam), are used to reproduce extreme events in one sea state. The events are chosen as, the measured event that generates the largest peak moment (exceedance probability of 0.05%) and one event with a slightly smaller peak moment (exceedance probability of 0.3%). Time series of free surface elevation, depth integrated forces, bending moment at the sea bed and pressure time series at 5 different heights on the cylinder are compared for two events between the measurements and the numerical models. The numerical pressure field on the monopile at impact is analyzed and stagnation pressures at the back side of the cylinder, in addition to the main impact pressure at the front side are observed. There is a good agreement between the OceanWave3D results and the measurements in the reproduction of the first selected event. However, for the larger selected event, OceanWave3D results in the peaks of time series are smaller than the measurements. This illustrates the sensitivity of the strong impact loads to the state of wave breaking. For small values of the inline force, the OpeanFOAM results provided good agreement with the measurements. The secondary load cycles are observed in the measured force and bending moment time series and the reproduced times series using OpenFOAM. Other Non-Article Part of Journal/Newspaper Arctic Technical University of Denmark: DTU Orbit Volume 1: Offshore Technology |
institution |
Open Polar |
collection |
Technical University of Denmark: DTU Orbit |
op_collection_id |
ftdtupubl |
language |
English |
description |
Two different numerical models, OceanWave3D and a coupled solver, OceanWave3D-OpenFOAM (Waves2Foam), are used to reproduce extreme events in one sea state. The events are chosen as, the measured event that generates the largest peak moment (exceedance probability of 0.05%) and one event with a slightly smaller peak moment (exceedance probability of 0.3%). Time series of free surface elevation, depth integrated forces, bending moment at the sea bed and pressure time series at 5 different heights on the cylinder are compared for two events between the measurements and the numerical models. The numerical pressure field on the monopile at impact is analyzed and stagnation pressures at the back side of the cylinder, in addition to the main impact pressure at the front side are observed. There is a good agreement between the OceanWave3D results and the measurements in the reproduction of the first selected event. However, for the larger selected event, OceanWave3D results in the peaks of time series are smaller than the measurements. This illustrates the sensitivity of the strong impact loads to the state of wave breaking. For small values of the inline force, the OpeanFOAM results provided good agreement with the measurements. The secondary load cycles are observed in the measured force and bending moment time series and the reproduced times series using OpenFOAM. |
format |
Other Non-Article Part of Journal/Newspaper |
author |
Ghadirian, Amin Bredmose, Henrik Schløer, Signe Dixen, Martin |
spellingShingle |
Ghadirian, Amin Bredmose, Henrik Schløer, Signe Dixen, Martin Extreme wave impacts on monopiles: Re-analysis of experimental data by a coupled CFD solver |
author_facet |
Ghadirian, Amin Bredmose, Henrik Schløer, Signe Dixen, Martin |
author_sort |
Ghadirian, Amin |
title |
Extreme wave impacts on monopiles: Re-analysis of experimental data by a coupled CFD solver |
title_short |
Extreme wave impacts on monopiles: Re-analysis of experimental data by a coupled CFD solver |
title_full |
Extreme wave impacts on monopiles: Re-analysis of experimental data by a coupled CFD solver |
title_fullStr |
Extreme wave impacts on monopiles: Re-analysis of experimental data by a coupled CFD solver |
title_full_unstemmed |
Extreme wave impacts on monopiles: Re-analysis of experimental data by a coupled CFD solver |
title_sort |
extreme wave impacts on monopiles: re-analysis of experimental data by a coupled cfd solver |
publisher |
American Society of Mechanical Engineers |
publishDate |
2017 |
url |
https://orbit.dtu.dk/en/publications/edb1510c-c2b5-46fb-8e20-fdbde70229ad https://doi.org/10.1115/OMAE2017-61727 |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Ghadirian , A , Bredmose , H , Schløer , S & Dixen , M 2017 , Extreme wave impacts on monopiles: Re-analysis of experimental data by a coupled CFD solver . in Proceedings of ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering : Offshore Technology . vol. 1 , American Society of Mechanical Engineers , 36st International Conference on Ocean, Offshore, and Arctic Engineering (OMAE36) , Trondheim , Norway , 25/06/2017 . https://doi.org/10.1115/OMAE2017-61727 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1115/OMAE2017-61727 |
container_title |
Volume 1: Offshore Technology |
_version_ |
1766295837352132608 |