Extreme wave impacts on monopiles: Re-analysis of experimental data by a coupled CFD solver

Amin Ghadirian, Henrik Bredmose, Signe Schløer, Martin Dixen

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

Abstract

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.
Original languageEnglish
Title of host publicationProceedings of ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering : Offshore Technology
Number of pages10
Volume1
PublisherAmerican Society of Mechanical Engineers
Publication date2017
ISBN (Print)978-0-7918-5763-2
DOIs
Publication statusPublished - 2017
Event36st International Conference on Ocean, Offshore, and Arctic Engineering (OMAE36) - Trondheim, Norway
Duration: 25 Jun 201730 Jun 2017

Conference

Conference36st International Conference on Ocean, Offshore, and Arctic Engineering (OMAE36)
CountryNorway
CityTrondheim
Period25/06/201730/06/2017

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