Cristin-resultat-ID: 1282901
Sist endret: 31. mai 2017, 08:53
NVI-rapporteringsår: 2015
Resultat
Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
2015

An investigation of riser fairing instability

Bidragsytere:
  • Trygve Kristiansen
  • Henning Braaten
  • Halvor Lie
  • Rolf Jarle Baarholm og
  • Kjetil Skaugset

Bok

ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering Volume 2: CFD and VIV
ISBN:
  • 978-0-7918-5648-2

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: 2015
Volum: 2015
Hefte: 2
Antall sider: 8
ISBN:
  • 978-0-7918-5648-2

Klassifisering

Fagfelt (NPI)

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

Beskrivelse Beskrivelse

Tittel

An investigation of riser fairing instability

Sammendrag

An analysis of galloping of two different types of riser fairings is presented. The first is named “long fairing” (LF) and the other “Short Crab Claw” (Short CC). The first one has a traditionally winged formed shape with a cord-to-diameter ratio of 2.43. The other one is more truncated in shape, and has cord-to-diameter ratio of only 1.4. Results from two related experimental set-ups are included in the work; one 2D experiment with towing tests of fairings that are free to translate and rotate to investigate instability regions, and one 2D experiment with fixed fairings to obtain drag, moment and lift curves. The present analysis is based on two-degrees of freedom, linearized equations of motion, and predicts a range of velocities where instability occurs. Below and above this region, the fairing is stable. Damping complicates the analysis. An empirical damping model is included and discussed. The two fairing types inhibit appreciably different instability characteristics. In particular, the Short CC fairing has a narrower instability region than the long fairing, and is therefore less prone to instabilities.

Bidragsytere

Trygve Kristiansen

  • Tilknyttet:
    Forfatter
    ved Energi og transport ved SINTEF Ocean

Henning Braaten

  • Tilknyttet:
    Forfatter
    ved Skip og havkonstruksjoner ved SINTEF Ocean

Halvor Lie

  • Tilknyttet:
    Forfatter
    ved Energi og transport ved SINTEF Ocean

Rolf Jarle Baarholm

  • Tilknyttet:
    Forfatter
    ved Equinor

Kjetil Skaugset

  • Tilknyttet:
    Forfatter
    ved Equinor
1 - 5 av 5

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ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering Volume 2: CFD and VIV.

NN, .. 2015, The American Society of Mechanical Engineers (ASME). Vitenskapelig antologi/Konferanseserie
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