Cristin-resultat-ID: 1613742
Sist endret: 7. desember 2018, 10:18
NVI-rapporteringsår: 2018
Resultat
Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
2018

A 2D Experimental and Numerical Study of Moonpools With Recess

Bidragsytere:
  • Senthuran Ravinthrakumar
  • Trygve Kristiansen og
  • Babak Ommani

Bok

ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering - Volume 9: Offshore Geotechnics; Honoring Symposium for Professor Bernard Molin on Marine and Offshore Hydrodynamics
ISBN:
  • 978-0-7918-5130-2

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: 2018
Volum: 2018
Hefte: 9
Antall sider: 10
ISBN:
  • 978-0-7918-5130-2
Open Access

Klassifisering

Fagfelt (NPI)

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

Beskrivelse Beskrivelse

Tittel

A 2D Experimental and Numerical Study of Moonpools With Recess

Sammendrag

Moonpool resonance is investigated in a two-dimensional setting in terms of regular, forced heave motions of a model with moonpool with different rectangular-shaped recess configurations. A recess is a reduced draft zone in the moonpool. Dedicated experiments were carried out. The model consisted of two boxes of 40 cm width each, with a distance of 20 cm between them. Recess configurations varying between 5 cm to 10 cm in length and 5 cm in height were tested. Different drafts were also tested. The free-surface elevation inside the moonpool was measured at eight locations. A large number of forcing periods, and five forcing amplitudes were tested. A time-domain Boundary Element Method (BEM) code based on linear potential flow theory was implemented to investigate the resonance periods, mode shapes as well as the moonpool response as predicted by (linear) potential flow theory. Dominant physical effects were discussed, in particular damping due to flow separation from the sharp corners of the moonpool inlet and recess. The effect of the recess on the piston-mode behavior is discussed. BEM simulations where the effect of flow separation is empirically modelled were also conducted. The non-dimensional moonpool response suggests strong viscous damping at piston-mode resonance. The viscous BEM simulations demonstrate improvement over inviscid BEM, although further improvement of the method is needed. The piston mode shapes are clearly different from the near flat free-surface elevation for a moonpool without recess, consistent with recently published theory.

Bidragsytere

Senthuran Ravinthrakumar

  • Tilknyttet:
    Forfatter
    ved Institutt for marin teknikk ved Norges teknisk-naturvitenskapelige universitet

Trygve Kristiansen

  • Tilknyttet:
    Forfatter
    ved Institutt for marin teknikk ved Norges teknisk-naturvitenskapelige universitet

Babak Ommani

  • Tilknyttet:
    Forfatter
    ved Energi og transport ved SINTEF Ocean
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