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Prediction of Drag Reduction Effect of Hydrogel Painting Having Shear Stress Responsibility by Using Mesoscale Model

Research Project

Project/Area Number 17K06963
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Naval and maritime engineering
Research InstitutionYokohama National University

Principal Investigator

Takagi Youhei  横浜国立大学, 大学院工学研究院, 准教授 (40435772)

Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2019: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2017: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Keywords機能性船底塗料 / ハイドロゲル / 乱流 / 抵抗低減 / 水槽試験 / 直接数値計算 / 摩擦抵抗低減 / 流体制御 / 平板境界層 / 平行平板間乱流 / 船底塗料 / 乱流渦構造 / 数値シミュレーション / メソスケール
Outline of Final Research Achievements

We have carried out the resistance test with a water tank and a simulation in order to investigate the frictional drag reduction of hydrogel paint that is one of the functional paints of ship hull used in commercial large ship. At the water tank experiment, the frictional drag on a flat plate coated with hydrogel paint was measured in a uniform flow. From the experimental result, it was found that turbulent eddy structures were different in the laminar-turbulence transition regime and fully-developed turbulence state, and the drag reduction effect became prominent in the transition regime. In addition, the roughness of painting film was numerically changed from homogenous pattern to anisotropic one and the flow simulation was conducted. From the numerical result, it was shown that the drag reduction effect was obtained due to the shear stress response of hydrogel paint if rough film was used.

Academic Significance and Societal Importance of the Research Achievements

機能性船底塗料の一つであるハイドロゲル塗料の摩擦抵抗低減効果をメソスケールな観点から明らかにするために実験及び数値解析を行った。ハイドロゲルの抵抗低減効果について流体力学的な観点から乱流中の渦構造との関係から明らかにし、抵抗低減率を向上させるための塗膜形成法を提案した。本研究で成果を実船での塗装に活かすことによって、大型船舶からのCO2削減、燃費性能の向上が期待できる。

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (12 results)

All 2019 2018 2017

All Journal Article (3 results) (of which Peer Reviewed: 3 results,  Open Access: 1 results) Presentation (9 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] Effect of Thin and Rough Layers of Porous Materials on Drag2019

    • Author(s)
      Valentinova Stoyanova Petya、Wang Lei、Sekimoto Atsushi、Okano Yasunori、Takagi Youhei
    • Journal Title

      JOURNAL OF CHEMICAL ENGINEERING OF JAPAN

      Volume: 52 Issue: 6 Pages: 493-500

    • DOI

      10.1252/jcej.18we318

    • NAID

      130007665273

    • ISSN
      0021-9592, 1881-1299
    • Year and Date
      2019-06-20
    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Experimental Study on the Friction Drag Reduction of Hydrogel Paint in a Boundary Layer on Flat Plate2019

    • Author(s)
      Takagi Youhei、Hino Takanori、Nishimura Masanari、Aso Hiromi
    • Journal Title

      Proc. ASME-JSME-KSME Joint Fluids Engineering Conference 2019

      Volume: 1

    • DOI

      10.1115/ajkfluids2019-4746

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Effect of thin and rough layers of porous materials on drag2019

    • Author(s)
      Petya Valentinova Stoyanova, Lei Wang, Atsushi Sekimoto, Yasunori Okano and Youhei Takagi
    • Journal Title

      Journal of Chemical Engineering of Japan

      Volume: 印刷中

    • NAID

      130007665273

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Presentation] Experimental Study on the Friction Drag Reduction of Hydrogel Paint in a Boundary Layer on Flat Plate2019

    • Author(s)
      Youhei Takagi, Takanori Hino, Masanari Nishimura, Hiromi Aso
    • Organizer
      ASME-JSME-KSME Joint Fluids Engineering Conference 2019
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] CFDによる塗膜粗面の抵抗評価(第二報)2019

    • Author(s)
      鈴木健吾, 日野孝則, 高木洋平
    • Organizer
      日本船舶海洋工学会令和元年春季講演会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Experimental study on the friction drag reduction of hydrogel paint in a boundary layer on flat plate2019

    • Author(s)
      Youhei Takagi, Takanori Hino, Masanari Nishimura and Hiromi Aso
    • Organizer
      ASME2019 AJKFluids
    • Related Report
      2018 Research-status Report
  • [Presentation] 平板境界層における水和型塗料の摩擦抵抗低減効果2018

    • Author(s)
      高木洋平, 中村麻子, 日野孝則, 鈴木和夫, 西村雅翔, 麻生宏実
    • Organizer
      平成30年日本船舶海洋工学会春季講演会
    • Related Report
      2018 Research-status Report
  • [Presentation] CFD による塗膜粗面の抵抗評価2018

    • Author(s)
      中野勇斗, 日野孝則, 高木洋平, 鈴木和夫
    • Organizer
      平成30年日本船舶海洋工学会春季講演会
    • Related Report
      2018 Research-status Report
  • [Presentation] 壁乱流中での高分子挙動と乱流渦の相関2018

    • Author(s)
      高木洋平,中田亜紀
    • Organizer
      化学工学会第83年会
    • Related Report
      2017 Research-status Report
  • [Presentation] 多孔質壁面の非等方性による乱流渦の変調2017

    • Author(s)
      高木洋平, Wang Lei, Petya Stoyanova, 岡野泰則
    • Organizer
      日本流体力学会年会2017
    • Related Report
      2017 Research-status Report
  • [Presentation] 回転を伴う一様等方乱流中での高分子挙動2017

    • Author(s)
      高木洋平
    • Organizer
      第31回数値流体力学シンポジウム
    • Related Report
      2017 Research-status Report
  • [Presentation] 摩擦抵抗低減効果を持つ機能性船底塗料の数値解析2017

    • Author(s)
      高木洋平, ワンライ, 岡野泰則
    • Organizer
      第8回推進・運動性能研究会
    • Related Report
      2017 Research-status Report

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Published: 2017-04-28   Modified: 2021-02-19  

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