Experimental Flow-Induced Motions of a FOWT Semi-Submersible Type (OC4 Phase II Floater)

DOI PDF 参考文献33件
  • Rodolfo T. Gonçalves
    OSPL—Ocean Space Planning Laboratory; Department of Systems Innovation, School of Engineering, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan
  • Maria E. F. Chame
    TPN—Numerical Offshore Tank;, Department of Naval Architecture and Ocean Engineering, Escola Politécnica, University of São Paulo, São Paulo, SP 05508-030, Brazil
  • Leandro S. P. Silva
    School of Mechanical Engineering, The University of Adelaide, Adelaide, SA 05508-030, Australia
  • Arjen Koop
    Research & Development, MARIN—Maritime Research Institute the Netherlands, Wageningen 6708, The Netherlands
  • Shinichiro Hirabayashi
    OSPL—Ocean Space Planning Laboratory; Department of Ocean Technology, Policy, and Environment, School of Frontier Sciences, The University of Tokyo, Kashiwa-shi, Chiba 277-8561, Japan
  • Hideyuki Suzuki
    OSPL—Ocean Space Planning Laboratory; Department of Systems Innovation, School of Engineering, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan

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<jats:title>Abstract</jats:title> <jats:p>Flow-induced motions (FIM) are an issue for floating offshore structures, such as multi-column platforms, as the phenomenon can decrease the fatigue life of the mooring, riser, and cable systems. The new concept of floating offshore wind turbines (FOWT) have a multi-column design that may be subjected to FIM. In the past, FIM was studied mainly for Oil & Gas platforms installed in deep waters. However, the FIM phenomenon of FOWT has been insufficiently explored. To rectify this, model tests were performed for the semisubmersible (SS) floating system design developed for the DeepCwind project (Offshore Code Comparison Collaboration Continuation (OC4) phase II). This paper will investigate the presence of FIM and show its importance in the design process of FOWT. Three different incidence angles of the current were tested, namely, 0, 90, and 180 deg. For each heading, 30 reduced velocities were tested, across the range 8000 &lt; Re &lt; 70,000. The results showed amplitudes in the transverse direction of around 70% of the diameter of the platform column, which is similar to those observed for deep-draft (DD) SS with circular columns. Note that these amplitude values are larger for a floater with a circular column, than for a platform with square columns. The results showed that as FIM occurred for this specific FOWT SS, its effect has to be considered in the mooring system and electric cable design.</jats:p>

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