Cristin-resultat-ID: 2010766
Sist endret: 18. mars 2022, 10:37
NVI-rapporteringsår: 2021
Resultat
Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
2021

An Experimental Investigation of Nonlinear Wave Generation by Flap Wavemakers

Bidragsytere:
  • Sebastien Fouques
  • Sebastien Jacques Marie Lafleche
  • Andreas Holm Akselsen og
  • Thomas Michel Sauder

Bok

ASME 2021 40th International Conference on Ocean, Offshore and Arctic Engineering Volume 6: Ocean Engineering
ISBN:
  • 978-0-7918-8516-1

Utgiver

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

Om resultatet

Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
Publiseringsår: 2021
Antall sider: 11
ISBN:
  • 978-0-7918-8516-1

Klassifisering

Fagfelt (NPI)

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

Beskrivelse Beskrivelse

Tittel

An Experimental Investigation of Nonlinear Wave Generation by Flap Wavemakers

Sammendrag

It is well known that flap wavemakers behave in a nonlinear way when either the flap angle or the flap velocity becomes large. Moreover, the hinge depth should be adapted to the period of the generated waves in order to minimize linear evanescent modes, which may contribute to the formation of nonlinear spurious waves. For example, imposing a sinusoidal motion with a relatively long period and a large amplitude to a short flap will result in a surface elevation composed of a regular wave with the same period as the flap motion, but also of a variety of harmonics with higher frequencies. Second-order harmonics can be predicted theoretically for regular and irregular waves, and they can be corrected by modifying the control signal of the wavemaker. However, there is no theory that can describe nor mitigate effects of orders higher than two. The design of the wavemaker is then essential to generate extreme sea states with good quality and predictability in a laboratory. In this paper, the nonlinearities of flap wavemakers are investigated experimentally for regular and irregular waves generated in SINTEF Ocean’s laboratories. Nonlinearities of order two and three are estimated from times series of the surface elevation measured at different locations by an array of wave probes. Particular focus is put on identifying the effects of the classical second-order correction on the second- and third-order harmonics.

Bidragsytere

Sebastien Fouques

  • Tilknyttet:
    Forfatter
    ved Skip og havkonstruksjoner ved SINTEF Ocean

Sebastien Jacques Marie Lafleche

  • Tilknyttet:
    Forfatter
    ved Energi og transport ved SINTEF Ocean

Andreas Holm Akselsen

  • Tilknyttet:
    Forfatter
    ved Skip og havkonstruksjoner ved SINTEF Ocean

Thomas Michel Sauder

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

Resultatet er en del av Resultatet er en del av

ASME 2021 40th International Conference on Ocean, Offshore and Arctic Engineering Volume 6: Ocean Engineering.

ASME, Digital Collection. 2021, The American Society of Mechanical Engineers (ASME). Vitenskapelig antologi/Konferanseserie
1 - 1 av 1