Motion response prediction by hybrid panel-stick models for a semi-submersible with bracings

Yingyi Liu, Changhong Hu, Makoto Sueyoshi, Hidetsugu Iwashita, Masashi Kashiwagi

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


A diffraction-radiation analysis is usually required when the hydrodynamic interactions between structural members occur in short waves. For bracings or small cylindrical members, which play important roles in the vicinity of the natural frequency of a floating platform, special care should be taken into account for the effect of viscous damping. Two hybrid panel-stick models are, therefore, developed, through the combination of the standard diffraction-radiation method and the Morison’s formulae, considering the effect of small members differently. The fluid velocity is obtained directly by the panel model. The viscous fluid force is calculated for individual members by the stick model. A semi-submersible type platform with a number of fine cylindrical structures, which is designed as a floating foundation for multiple wind turbines, is analyzed as a numerical example. The results show that viscous force has significant influence on the hydrodynamic behavior of the floating body and can successfully be considered by the proposed hybrid models.

Original languageEnglish
Pages (from-to)742-757
Number of pages16
JournalJournal of Marine Science and Technology (Japan)
Issue number4
Publication statusPublished - Dec 1 2016

All Science Journal Classification (ASJC) codes

  • Oceanography
  • Ocean Engineering
  • Mechanics of Materials
  • Mechanical Engineering


Dive into the research topics of 'Motion response prediction by hybrid panel-stick models for a semi-submersible with bracings'. Together they form a unique fingerprint.

Cite this