Vertical Wave Impacts on Offshore Wind Turbine Inspection Platforms

Henrik Bredmose, Niels Gjøl Jacobsen

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Abstract

Breaking wave impacts on a monopile at 20 m depth are computed with a VOF (Volume Of Fluid) method. The impacting waves are generated by the second-order focused wave group technique, to obtain waves that break at the position of the monopile. The subsequent impact from the vertical run-up flow on a horizontal inspection platform is computed for five different platform levels. The computational results show details of monopile impact such as slamming pressures from the overturning wave front and the formation of run-up flow. The results show that vertical platform impacts can occur at 20 m water depth. The dependence of the vertical platform load to the platform level is discussed. Attention is given to the significant downward force that occur after the upward force associated with the vertical impact. The effect of the numerical resolution on the results is assessed. The position of wave overturning is found to be influenced by the grid resolution. For the lowest platform levels, the vertical impact is found to contribute to the peak values of in-line force and overturning moment.
Original languageEnglish
Title of host publicationProceedings of the ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering
Volume5
PublisherAmerican Society of Mechanical Engineers
Publication date2011
Pages645-654
ISBN (Print)9780791844373
Publication statusPublished - 2011
Event30th International Conference on Ocean, Offshore and Arctic Engineering - Rotterdam, Netherlands
Duration: 19 Jun 201124 Jun 2011
Conference number: 30
https://www.asmeconferences.org/OMAE2011/

Conference

Conference30th International Conference on Ocean, Offshore and Arctic Engineering
Number30
CountryNetherlands
CityRotterdam
Period19/06/201124/06/2011
Internet address

Bibliographical note

© ASME

Cite this

Bredmose, H., & Jacobsen, N. G. (2011). Vertical Wave Impacts on Offshore Wind Turbine Inspection Platforms. In Proceedings of the ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering (Vol. 5, pp. 645-654). American Society of Mechanical Engineers.
Bredmose, Henrik ; Jacobsen, Niels Gjøl. / Vertical Wave Impacts on Offshore Wind Turbine Inspection Platforms. Proceedings of the ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering. Vol. 5 American Society of Mechanical Engineers, 2011. pp. 645-654
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Bredmose, H & Jacobsen, NG 2011, Vertical Wave Impacts on Offshore Wind Turbine Inspection Platforms. in Proceedings of the ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering. vol. 5, American Society of Mechanical Engineers, pp. 645-654, 30th International Conference on Ocean, Offshore and Arctic Engineering, Rotterdam, Netherlands, 19/06/2011.

Vertical Wave Impacts on Offshore Wind Turbine Inspection Platforms. / Bredmose, Henrik; Jacobsen, Niels Gjøl.

Proceedings of the ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering. Vol. 5 American Society of Mechanical Engineers, 2011. p. 645-654.

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

TY - GEN

T1 - Vertical Wave Impacts on Offshore Wind Turbine Inspection Platforms

AU - Bredmose, Henrik

AU - Jacobsen, Niels Gjøl

N1 - © ASME

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N2 - Breaking wave impacts on a monopile at 20 m depth are computed with a VOF (Volume Of Fluid) method. The impacting waves are generated by the second-order focused wave group technique, to obtain waves that break at the position of the monopile. The subsequent impact from the vertical run-up flow on a horizontal inspection platform is computed for five different platform levels. The computational results show details of monopile impact such as slamming pressures from the overturning wave front and the formation of run-up flow. The results show that vertical platform impacts can occur at 20 m water depth. The dependence of the vertical platform load to the platform level is discussed. Attention is given to the significant downward force that occur after the upward force associated with the vertical impact. The effect of the numerical resolution on the results is assessed. The position of wave overturning is found to be influenced by the grid resolution. For the lowest platform levels, the vertical impact is found to contribute to the peak values of in-line force and overturning moment.

AB - Breaking wave impacts on a monopile at 20 m depth are computed with a VOF (Volume Of Fluid) method. The impacting waves are generated by the second-order focused wave group technique, to obtain waves that break at the position of the monopile. The subsequent impact from the vertical run-up flow on a horizontal inspection platform is computed for five different platform levels. The computational results show details of monopile impact such as slamming pressures from the overturning wave front and the formation of run-up flow. The results show that vertical platform impacts can occur at 20 m water depth. The dependence of the vertical platform load to the platform level is discussed. Attention is given to the significant downward force that occur after the upward force associated with the vertical impact. The effect of the numerical resolution on the results is assessed. The position of wave overturning is found to be influenced by the grid resolution. For the lowest platform levels, the vertical impact is found to contribute to the peak values of in-line force and overturning moment.

M3 - Article in proceedings

SN - 9780791844373

VL - 5

SP - 645

EP - 654

BT - Proceedings of the ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering

PB - American Society of Mechanical Engineers

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Bredmose H, Jacobsen NG. Vertical Wave Impacts on Offshore Wind Turbine Inspection Platforms. In Proceedings of the ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering. Vol. 5. American Society of Mechanical Engineers. 2011. p. 645-654