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Understanding the Mechanism of Freak Waves and Establishing a New Breaking Criterion in Multi-Directional Waves

Research Project

Project/Area Number 22K14429
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 24020:Marine engineering-related
Research InstitutionKyoto University

Principal Investigator

Kanehira Taiga  京都大学, 防災研究所, 特定研究員 (50880019)

Project Period (FY) 2022-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2023: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2022: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Keywords砕波 / 多方向波浪場 / 粒子法 / 数値シミュレーション / 海洋巨大波 / SPH法 / 多方向波 / 破波指標
Outline of Research at the Start

船舶が頻繁に往来する沖合は,人類の欠かせない経済活動の場であり,これら経済活動のさらなる発展には,海洋構造物にとって危険な海洋巨大波 の実態解明が不可欠である.しかしながら,その突発性故,海洋巨大波に対する設計指針は十分に確立されておらず,人命にかかわる海難事故は後を絶たない.

このような社会的背景の下,本課題では,粒子法を用いた数値シミュレーション技術を用い,海洋巨大波の発達過程,波形などの幾何学的情報,破波形態,最大外力の推定など,海洋巨大波の実態解明に挑む.

Outline of Final Research Achievements

Offshore areas where ships frequently navigate are rich in ocean energy resources and are essential for economic activities. For the further development of economic activities, it is necessary to establish breaking wave criterion and methods for estimating maximum wave forces in offshore multi-directional wave fields.

In this study, we experimentally obtained spatial waveforms of freak waves in bi-directional wave groups, allowing for the validation of numerical models of freak waves in multi-directional wave fields. Additionally, we developed a coupling model combining a potential calculation model, which solves large-scale wave fields, and a particle method, which resolves non-linear breaking phenomena in smaller regions. This approach reduces computational costs and enables the estimation of maximum wave forces on three-dimensional structures.However, challenges remain in achieving bidirectional coupling in multi-directional wave fields, which will be addressed in future research.

Academic Significance and Societal Importance of the Research Achievements

海洋エネルギーの賦存量が多く経済活動に不可欠な場所である沖合の経済的利用が難しいのは、多方向波浪場において出現する海洋巨大波の最大波力推定手法が未確立なためだ。本研究では多方向波群における破波現象の高密度情報を実験的に取得。これにより、従来の一方向波浪場のみならず、多方向波浪場における数値計算モデルとの精度検証が可能となった。さらに、計算負荷を低減した数値計算モデルを開発し、3次元空間における海洋巨大波の最大波力推定が可能となった。今後、開発した数値計算技術によって、多方向波浪場における海洋巨大波の物理諸量の詳細が明らかになり、沖合の経済活動域の拡大に繋がると考えられる。

Report

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

    (5 results)

All 2024 2023 2022 Other

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

  • [Int'l Joint Research] The University of Edinburgh/The University of Oxford/The University of Manchester(英国)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] University of Edinburgh/University of Manchester/University of Oxford(英国)

    • Related Report
      2022 Research-status Report
  • [Journal Article] The effects of smoothing length on the onset of wave breaking in smoothed particle hydrodynamics (SPH) simulations of highly directionally spread waves2022

    • Author(s)
      T. Kanehira, M.L. McAllister, S. Draycott, T. Nakashima, D.M. Ingram, T.S. van den Bremer, H. Mutsuda
    • Journal Title

      Computational Particle Mechanics

      Volume: - Issue: 5 Pages: 1-17

    • DOI

      10.1007/s40571-022-00463-z

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Numerical modelling of extreme wave interactions with a vertical cylinder using a particle-based method2024

    • Author(s)
      Taiga Kanehira
    • Organizer
      ICCE 2024 - 38th International Conference on Coastal Engineering
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Integration DualSPHysics and OceanWave3D for predicting wave-induced forces on coastal structures2023

    • Author(s)
      Taiga Kanehira
    • Organizer
      Taiwan-Japan-Korea Joint Workshop
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research

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Published: 2022-04-19   Modified: 2025-01-30  

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