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Development of a simple prediction model for vortex-induced motion of floating platforms with arbitrarily placed columns

Research Project

Project/Area Number 21K04496
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 24020:Marine engineering-related
Research InstitutionThe University of Tokyo

Principal Investigator

Hirabayashi Shinichiro  東京大学, 大学院新領域創成科学研究科, 准教授 (90463877)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2023: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2022: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2021: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywords浮体式プラットフォーム / 渦励起運動 / 複数カラム / 低アスペクト比 / 機械学習 / 共振 / ピッチング / 上下運動 / カラム配置 / 数値流体力学
Outline of Research at the Start

本研究では、流れの中でのカラム同士の渦干渉がもたらす流体力について、カラムの位置関係を表すパラメータに応じてデータベース化することで、複数の円柱や角柱を任意の場所に配置した浮体において渦励起運動を簡易的に予測するモデルを開発する。本モデルにより浮体の設計段階において水槽実験や数値流体シミュレーションを実施することなく渦励起運動を予測できるようになり、低動揺かつ高寿命な浮体の設計が促進されることが期待される。

Outline of Final Research Achievements

The trend of hydrodynamic forces caused by vortex interference between columns of a semi-submersible floater in a flow was clarified by constructing a hydrodynamic force database based on model experiments, and the possibility and limitation of estimation by mathematical models were shown. It was shown that each fluid force of four circular cylinders from the database of two cylinders was accurately estimated by machine learning, and our initial goal of estimating fluid forces at arbitrary numbers and locations was achieved under partial condition. As a new finding concerning vortex-induced motion, it was shown for the first time that the vortex-induced motion in the vertical direction such as heave, pitch, and roll can happen for the floater with horizontally extending cylindrical member in the submerged part, which have never been focused on so far.

Academic Significance and Societal Importance of the Research Achievements

浮体式洋上風車の浮体部として今後活用が見込まれるセミサブ型は没水部が複数の細長い部材で構成され、流れの中で各部材から放出される渦、あるいはそれらの干渉により複雑な浮体運動を生じる。本研究の成果により、この渦干渉の影響は数理モデルや機械学習を用いて簡易的に予測できることが示され、今後データベースを充実させることにより、将来的には浮体設計に生かせるレベルの実用的なモデル開発に繋がる知見を得た。本研究で新たな知見として得られた縦方向の渦励起運動についても、同様に簡易モデルで扱うことができると考えられる。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (7 results)

All 2023 2022

All Journal Article (2 results) (of which Peer Reviewed: 1 results) Presentation (5 results) (of which Int'l Joint Research: 2 results)

  • [Journal Article] 2023S-GS10-3 Modelling of hydrodynamic force for two columns with low aspect ratio in uniform flow2023

    • Author(s)
      平林 紳一郎、松下 凜太郎
    • Journal Title

      Conference Proceedings The Japan Society of Naval Architects and Ocean Engineers

      Volume: 36 Issue: 0 Pages: 491-493

    • DOI

      10.14856/conf.36.0_491

    • ISSN
      2424-1628
    • Year and Date
      2023-06-01
    • Related Report
      2023 Annual Research Report
  • [Journal Article] Experimental Study on Flow-Induced Pitch, Roll, and Heave Motions of a Semi-Submersible Floater With Long Pontoons2023

    • Author(s)
      Naito Yuki、Hirabayashi Shinichiro、Suzuki Hideyuki、Goncalves Rodolfo
    • Journal Title

      Proceedings of International Conference on Ocean, Offshore, and Arctic Engineering (OMAE)

      Volume: OMAE2023

    • DOI

      10.1115/omae2023-104664

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Presentation] 一様流中に配置された低アスペクト比2円筒に作用する流体力のモデル化2023

    • Author(s)
      平林 紳一郎、松下 凜太郎
    • Organizer
      日本船舶海洋工学会講演会令和5年春季講演会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Experimental Study on Flow-Induced Pitch, Roll, and Heave Motions of a Semi-Submersible Floater With Long Pontoons2023

    • Author(s)
      Naito Yuki、Hirabayashi Shinichiro、Suzuki Hideyuki、Goncalves Rodolfo
    • Organizer
      OMAE2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 一様流中に配置された低アスペクト比 2 円筒に作用する流体力のモデル化2023

    • Author(s)
      平林 紳一郎、松下 凜太郎
    • Organizer
      日本船舶海洋工学会 令和5年春季講演会
    • Related Report
      2022 Research-status Report
  • [Presentation] EXPERIMENTAL STUDY ON FLOW-INDUCED PITCH, ROLL, AND HEAVE MOTIONS OF A SEMI-SUBMERSIBLE FLOATER WITH LONG PONTOONS2023

    • Author(s)
      Yuki Naito, Shinichiro Hirabayashi, Hideyuki Suzuki, Rodolfo T. Goncalves
    • Organizer
      ASME 2023 42nd International Conference on Ocean, Offshore and Arctic Engineering (OMAE2023)
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] A Study of Heave and Roll and Pitch Motion in Flow of Lightweight Floating Offshore Wind Turbines2022

    • Author(s)
      内藤 悠基
    • Organizer
      日本船舶海洋工学会 令和4年秋季講演会 若手ポスターセッション
    • Related Report
      2022 Research-status Report

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Published: 2021-04-28   Modified: 2025-01-30  

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