Cristin-resultat-ID: 1074202
Sist endret: 31. mai 2017, 08:32
NVI-rapporteringsår: 2013
Resultat
Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
2013

Second-order random wave kinematics and resulting loads on a bottom-fixed slender monopile

Bidragsytere:
  • Carl Trygve Stansberg
  • Sébastien Fouques
  • Andreas Amundsen og
  • Ole David Økland

Bok

32nd International Conference on Ocean, Offshore and Arctic Engineering Volume 8: Ocean Renewable Energy
ISBN:
  • 978-0-7918-5542-3

Utgiver

The American Society of Mechanical Engineers (ASME)
NVI-nivå 1

Serie

International Conference on Offshore Mechanics and Arctic Engineering (OMAE) [proceedings]
ISSN 1523-651X
NVI-nivå 1

Om resultatet

Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
Publiseringsår: 2013
Volum: 2013
Hefte: 8
Antall sider: 10
ISBN:
  • 978-0-7918-5542-3

Klassifisering

Fagfelt (NPI)

Fagfelt: Marin og maritim teknologi
- Fagområde: Realfag og teknologi

Beskrivelse Beskrivelse

Tittel

Second-order random wave kinematics and resulting loads on a bottom-fixed slender monopile

Sammendrag

The importance of including second-order nonlinear random wave kinematics in the numerical prediction of drag-induced shear forces and moments, at various levels on a bottom-fixed slender monopile in 40m water depth, is investigated. A vertical circular cylinder of diameter 0.5m is considered, representing typical dimensions of members in jacket type foundations of offshore wind turbines. The focus is here on the wave loads only, and wind and a propeller are therefore not included in this study. In particular, the main focus is on the effects from second-order random wave kinematics on the structural quasi-static time-varying loads due to drag forces in heavy storm wave conditions. Comparisons are made to the traditional use of Airy waves with various ways of stretching. An in-house numerical FEM code developed for structural analysis, NIRWANA, is used for this study. Thus one purpose of the present work is also to verify the implementation of the second-order random waves in the code. The results show significant effects, especially in the wave zone. Extreme crests are around 15%–20% increased, free-surface extreme particle velocities increase by around 30%–40%, while the velocities at levels below MWL are, on the other hand, somewhat reduced. The resulting peak shear forces, and in particular the moments, are thereby increased by typically 50%–100% in the upper parts of the column. At the base the peak shear forces are comparable to the traditional methods, while moments are still somewhat higher. Another effect is the generation of more high-frequency load contributions, which may be important to address further with respect to natural frequencies of such towers.

Bidragsytere

Carl Trygve Stansberg

  • Tilknyttet:
    Forfatter
    ved Skip og havkonstruksjoner ved SINTEF Ocean

Sebastien Fouques

Bidragsyterens navn vises på dette resultatet som Sébastien Fouques
  • Tilknyttet:
    Forfatter
    ved Skip og havkonstruksjoner ved SINTEF Ocean

Andreas Amundsen

  • Tilknyttet:
    Forfatter
    ved Energi og transport ved SINTEF Ocean

Ole David Økland

  • Tilknyttet:
    Forfatter
    ved Skip og havkonstruksjoner ved SINTEF Ocean
1 - 4 av 4

Resultatet er en del av Resultatet er en del av

32nd International Conference on Ocean, Offshore and Arctic Engineering Volume 8: Ocean Renewable Energy.

ASME, conference. 2013, The American Society of Mechanical Engineers (ASME). Vitenskapelig antologi/Konferanseserie
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