Cristin-resultat-ID: 1876102
Sist endret: 23. april 2021, 13:19
NVI-rapporteringsår: 2021
Resultat
Vitenskapelig artikkel
2021

Investigation of moonpools as pitch motion reducing device

Bidragsytere:
  • Lars M. Utnes Reiersen
  • Trygve Kristiansen
  • Babak Ommani og
  • Arnt Gunvald Fredriksen

Tidsskrift

Applied Ocean Research
ISSN 0141-1187
e-ISSN 1879-1549
NVI-nivå 1

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2021
Publisert online: 2021
Trykket: 2021
Volum: 108:102477
Sider: 1 - 15
Open Access

Importkilder

Scopus-ID: 2-s2.0-85099173441

Beskrivelse Beskrivelse

Tittel

Investigation of moonpools as pitch motion reducing device

Sammendrag

Moonpools as a device for reducing pitch motion is investigated experimentally, numerically and by an approximate theory. A two-dimensional study is carried out of a rectangular body with two moonpools. Forced heave and pitch motion, as well as freely floating body in regular waves are studied. The body geometry is varied; two drafts and five different moonpool inlet configurations are considered; rounded and squared inlets, as well as vertical plates (appendages) extending below the inlet with three different depths. The outer corners of the body are square. There is a resonance as well as cancellation period in both pitch and heave, where the cancellation is the desired effect. By cancellation period we refer to a narrow period range where the pitch motion is nearly cancelled, due to the pressures induced by the moonpool piston-mode resonance. Our investigation reveals that the cases with rounded and square moonpool inlet geometries are most efficient in cancelling the pitch motions.

Bidragsytere

Lars M. Utnes Reiersen

  • 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 Institutt for marin teknikk ved Norges teknisk-naturvitenskapelige universitet
  • Tilknyttet:
    Forfatter
    ved Skip og havkonstruksjoner ved SINTEF Ocean

Arnt Gunvald Fredriksen

  • Tilknyttet:
    Forfatter
    ved Entail AS
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