A two-dimensional numerical study of radiation of piston mode fluid resonance in a narrow gap

Lei Tan, Tomoki Ikoma, Yasuhiro Aida, Koichi Masuda

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Radiation damping may play an important role in the prediction of gap resonance amplitude by potential flow models. In this paper, the radiation of the gap resonance between twin fixed floating boxes is numerically studied by using a linear potential flow model in frequency domain. An impermeable lid is forced to heave at the free surface in the gap. The characteristics of its added mass and radiation damping, and radiation wave amplitude in the far field are calculated under various geometric conditions. Moreover, the ratio of radiation damping to the viscous damping due to wall friction and/or flow separation is quantified. We find that the ratio of the viscous damping force due to wall friction to radiation damping is approximately 34%~43%, and that due to flow separation to radiation damping is about 140%~320%. The results well explain the prediction performance of potential flow models with/without the viscous damping due to wall friction and/or flow separation.

Original languageEnglish
Title of host publicationProceedings of the 31st International Ocean and Polar Engineering Conference, ISOPE 2021
PublisherInternational Society of Offshore and Polar Engineers
Pages1680-1686
Number of pages7
ISBN (Print)9781880653821
Publication statusPublished - 2021
Event31st International Ocean and Polar Engineering Conference, ISOPE 2021 - Virtual, Online
Duration: Jun 20 2021Jun 25 2021

Publication series

NameProceedings of the International Offshore and Polar Engineering Conference
ISSN (Print)1098-6189
ISSN (Electronic)1555-1792

Conference

Conference31st International Ocean and Polar Engineering Conference, ISOPE 2021
CityVirtual, Online
Period6/20/216/25/21

All Science Journal Classification (ASJC) codes

  • Energy Engineering and Power Technology
  • Ocean Engineering
  • Mechanical Engineering

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