Influence of Spurious Waves on the Performance of Active Absorption Systems in Oblique Waves

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Abstract

Existing active absorption systems do not take into account the spurious waves caused by the segmentation of the wavemaker. Thus, the theoretical estimated performance curves for oblique waves are only valid for infinitely narrow segments. In the present paper, it is demonstrated that by ignoring the spurious waves, an unstable system might be designed for box‐mode paddles (piecewise constant segmentation). For vertical hinged pistons (piecewise linear segmentation), the results are the opposite, as the stability of the system is improved at high frequencies when a finite paddle width is considered. It is also shown that finite discretization leads to a directional influence in the system, even for a pseudo‐3D active absorption system. This effect is more pronounced for vertical hinged systems compared to box‐mode paddles.
Original languageEnglish
Article number185
JournalJournal of Marine Science and Engineering
Volume8
Issue number3
ISSN2077-1312
DOIs
Publication statusPublished - 2020
EventFuture Paths and Needs in Wave Modelling Workshop - Trondheim, Norway
Duration: 21 Oct 201922 Oct 2019

Workshop

WorkshopFuture Paths and Needs in Wave Modelling Workshop
CountryNorway
CityTrondheim
Period21/10/201922/10/2019

Bibliographical note

Special Issue with selected papers from the Future Paths and Needs in Wave Modelling Workshop

Keywords

  • Active absorption
  • Reflection compensation
  • Spurious waves
  • Directional waves
  • Wave generation
  • Wave basin design
  • Wavemakers

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