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A study to create a drag reducing wall with a heterogeneous porous structure

Research Project

Project/Area Number 19H02069
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 19010:Fluid engineering-related
Research InstitutionOsaka Prefecture University

Principal Investigator

Suga Kazuhiko  大阪府立大学, 工学(系)研究科(研究院), 教授 (60374089)

Co-Investigator(Kenkyū-buntansha) 桑田 祐丞  大阪府立大学, 工学(系)研究科(研究院), 准教授 (40772851)
金田 昌之  大阪府立大学, 工学(系)研究科(研究院), 准教授 (50346855)
Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥17,810,000 (Direct Cost: ¥13,700,000、Indirect Cost: ¥4,110,000)
Fiscal Year 2021: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2020: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2019: ¥12,480,000 (Direct Cost: ¥9,600,000、Indirect Cost: ¥2,880,000)
Keywords乱流 / 多孔体 / 流動抵抗 / 計測実験 / 数値解析 / 境界層 / 多孔体界面 / ケルビン-ヘルムホルツ不安定 / 機能性構造 / 多孔質 / 透過率 / 流動計測 / ケルビンーヘルムホルツ不安定
Outline of Research at the Start

多孔体のヘテロ構造により,飛躍的な抵抗低減機能を持った流動界面を創出し実証する.多孔体界面では大きな滑り速度が現れるが表層内速度分布の変曲点により,ケルビン・ヘルムホルツ(K-H)不安定波が発達し,早い乱流遷移で乱れも増大するが,K-H波の発達を抑えれば,流動抵抗はむしろ低下すると予想される.K-H波は多孔体の透過率等構造に影響を受けるので,構造をヘテロ化させることで,K-H波の消波効果を狙う.研究方法は多孔体構造を詳細に解像した直接数値解析により,ヘテロ性と消波効果に関する流動機構の力学的解明を行う.またヘテロ多孔体界面流動の詳細なPIV流動計測実験から数値解析で得られた効果を実証する.

Outline of Final Research Achievements

To create a drag reducing wall with a heterogeneous porous structure, we conducted the research by both numerical analysis and experiments. The following findings are obtained.
1) It was confirmed that when the porous interface is partially impermeable, the Kelvin-Helmholtz (KH) waves were damped on such a part, and the flow resistance is reduced by up to 11% from the fully permeable structure.2) We found the existence of a region where the flow resistance does not depend on the surface structure of the porous media. It was confirmed that the reason why the turbulence field is less dependent on this surface structure is due to the development and existence of KH waves whose scale is proportional to the channel height.3) We devised a layered porous structure that can suppress the generation of KH waves, and confirmed its effect in experiments.

Academic Significance and Societal Importance of the Research Achievements

多孔体界面乱流の流動計測実験と,それを補完する多孔体構造を詳細に解像した世界でこれまでに例を見ない複雑界面乱流の直接数値解析を行い,多孔体表面構造の非均質性とケルビン-ヘルムホルツ波の生成に関する力学的解明を進めたことの学術的意義は高いと考えている.同時に乱流流動抵抗を低減できる多孔体構造を考案し,試作して特許出願した.さらなる詳細検証が必要であるが,その有効性を評価確認したことの工学的意義も高いと考えている.

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Annual Research Report
  • 2019 Annual Research Report
  • Research Products

    (27 results)

All 2022 2021 2020 2019

All Journal Article (5 results) (of which Peer Reviewed: 5 results,  Open Access: 1 results) Presentation (21 results) (of which Int'l Joint Research: 1 results,  Invited: 1 results) Patent(Industrial Property Rights) (1 results)

  • [Journal Article] Turbulent channel fows over porous rib-roughed walls2022

    • Author(s)
      Y. Okazaki, Y. Takase, Y. Kuwata, K. Suga
    • Journal Title

      Exp. Fluids

      Volume: 63 Issue: 4 Pages: 66-66

    • DOI

      10.1007/s00348-022-03415-8

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Describing characteristic parameters of turbulence over two-dimensional porous roughness2021

    • Author(s)
      Y. Okazaki, Y. Takase, Y. Kuwata, K. Suga
    • Journal Title

      Journal of Thermal Science and Technology

      Volume: 16 Issue: 2 Pages: JTST0027-JTST0027

    • DOI

      10.1299/jtst.2021jtst0027

    • NAID

      130008037500

    • ISSN
      1880-5566
    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Mean Velocity Profiles over Streamwise-Aligned Permeable Ridges2021

    • Author(s)
      Y. Okazaki, Y. Takase, Y. Kuwata, K. Suga
    • Journal Title

      Progress in Turbulence

      Volume: 9 Pages: 51-56

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Turbulence characteristics over k-type rib roughened porous walls2020

    • Author(s)
      Y. Okazaki, A. Shimizu, Y. Kuwata, K. Suga
    • Journal Title

      Int. J. Heat Fluid Flow

      Volume: 82 Pages: 108541-108541

    • DOI

      10.1016/j.ijheatfluidflow.2020.108541

    • NAID

      120006886161

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Direct numerical simulation of turbulent conjugate heat transfer in a porous-walled duct flow2020

    • Author(s)
      Yusuke Kuwata, Koji Tsuda, Kazuhiko Suga
    • Journal Title

      Journal of Fluid Mechanics

      Volume: 904

    • DOI

      10.1017/jfm.2020.669

    • NAID

      120006938352

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Presentation] Measurement of turbulence over streamwise preferential medium2022

    • Author(s)
      M. Morimoto, Y. Okazaki, Y. Kuwata, K. Suga
    • Organizer
      American Physical Society March Meeting, 2022, Chicago, USA
    • Related Report
      2021 Annual Research Report
  • [Presentation] PIV measurement of turbulence over a streamwise preferential porous medium2021

    • Author(s)
      M. Morimoto, Y. Okazaki, Y. Kuwata, K. Suga
    • Organizer
      14th International Symposium on Particle Image Velocimetry, Chicago, USA, August 1-4, 2021 (online)
    • Related Report
      2021 Annual Research Report
  • [Presentation] Turbulent Characteristics over Permeable Rough Walls2021

    • Author(s)
      Y. Okazaki, Y. Takase, Y. Kuwata, K. Suga
    • Organizer
      2nd Asian Conference on Thermal Sciences, Fukuoka, Japan, Oct.3-7, 2021 (online)
    • Related Report
      2021 Annual Research Report
  • [Presentation] 透過性粗面乱流の平均速度スケーリングについての考察2021

    • Author(s)
      岡﨑友紀,高瀬夢人,桑田祐丞,須賀一彦
    • Organizer
      第57回日本伝熱シンポジウム
    • Related Report
      2021 Annual Research Report
  • [Presentation] 主流方向透過率優位な多孔体界面における乱流のPIV計測2021

    • Author(s)
      森本真尋,岡﨑友紀,桑田祐丞,須賀一彦
    • Organizer
      第57回日本伝熱シンポジウム
    • Related Report
      2021 Annual Research Report
  • [Presentation] 主流方向優位な多孔体による乱流抵抗低減の可能性に関する実験的検証2021

    • Author(s)
      森本真尋,岡﨑友紀,桑田祐丞,須賀一彦
    • Organizer
      日本流体力学会年会2021
    • Related Report
      2021 Annual Research Report
  • [Presentation] 構造粗さを有する多孔体界面乱流の平均速度スケーリング2021

    • Author(s)
      岡﨑友紀,高瀬夢人,桑田祐丞,須賀一彦
    • Organizer
      日本機械学会99期熱工学部門熱工学カンファレンス2021
    • Related Report
      2021 Annual Research Report
  • [Presentation] Mean Velocity Profiles over Streamwise-Aligned Permeable Ridges2021

    • Author(s)
      Y. Okazaki, Y. Takase, Y. Kuwata, K. Suga
    • Organizer
      iTi (interdisciplinary Turbulence initiative) 2021 - conference on Turbulence IX, Bertinoro, Italy, online, Feb. 25-26, 2021
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 主流方向透過率優位な多孔体による乱流抵抗低減の可能性に関する実験的検証2021

    • Author(s)
      森本真尋,岡崎友紀,桑田祐丞,須賀一彦
    • Organizer
      日本機械学会 関西支部第96期定時総会講演会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 多孔体界面乱流における対数速度パラメータのスケーリング2021

    • Author(s)
      岡﨑友紀,籏福亘,桑田祐丞,須賀一彦
    • Organizer
      日本機械学会 関西支部第96期定時総会講演会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 多孔質壁面乱流の構造とスケーリングに関する実験的研究2021

    • Author(s)
      岡崎友紀,桑田祐丞,須賀一彦
    • Organizer
      日本機械学会 関西支部第96期定時総会講演会
    • Related Report
      2020 Annual Research Report
    • Invited
  • [Presentation] 透過性粗面の乱流特性と平均速度のスケーリングに関する実験的研究2021

    • Author(s)
      高瀬夢人,岡崎友紀,桑田祐丞,須賀一彦
    • Organizer
      日本機械学会 関西支部第96期定時総会講演会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 壁面透過性が2次元粗面乱流に与える影響についてのDNS研究2020

    • Author(s)
      西山悠大,西野和希,桑田祐丞,須賀一彦
    • Organizer
      第56回日本伝熱シンポジウム
    • Related Report
      2020 Annual Research Report
  • [Presentation] ヘテロ多孔体界面におけるケルビン・ヘルムホルツ波の発達2020

    • Author(s)
      岡崎 友紀, 桑田 祐丞, 須賀 一彦
    • Organizer
      第56回日本伝熱シンポジウム
    • Related Report
      2020 Annual Research Report
  • [Presentation] 透過性を有する2次元粗面乱流DNS2020

    • Author(s)
      西山 悠大,西野 和希,桑田 祐丞,須賀 一彦
    • Organizer
      日本流体力学会 年会2020
    • Related Report
      2020 Annual Research Report
  • [Presentation] PIV計測データに基づく透過性粗面乱流のスケーリング2020

    • Author(s)
      高瀬夢人,岡崎友紀,桑田祐丞,須賀一彦
    • Organizer
      日本流体力学会 年会2020
    • Related Report
      2020 Annual Research Report
  • [Presentation] 透過性を有する粗面境界層の乱流輸送2020

    • Author(s)
      岡﨑友紀,高瀬夢人,桑田祐丞,須賀一彦
    • Organizer
      日本機械学会 第98期 流体工学部門 講演会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 格子ボルツマン法による透過性粗面乱流の直接数値解析2020

    • Author(s)
      西野 和希, 西山 悠大, 桑田 祐丞, 須賀 一彦
    • Organizer
      第34回数値流体力学シンポジウム
    • Related Report
      2020 Annual Research Report
  • [Presentation] ヘテロ構造多孔体界面乱流のDNS2020

    • Author(s)
      西山悠大,桑田祐丞,須賀一彦
    • Organizer
      日本機械学会 関西支部第95期定時総会講演会,同志社大学
    • Related Report
      2019 Annual Research Report
  • [Presentation] ヘテロ多孔体界面におけるケルビン・ヘルムホルツ波の発達2020

    • Author(s)
      岡崎友紀,桑田祐丞,須賀一彦
    • Organizer
      第57回日本伝熱シンポジウム,金沢
    • Related Report
      2019 Annual Research Report
  • [Presentation] 多孔体界面乱流の摩擦抵抗低減を実現する表面構造の探索2019

    • Author(s)
      岡崎友紀, 清水歩実,桑田祐丞,須賀一彦
    • Organizer
      第56回日本伝熱シンポジウム,徳島
    • Related Report
      2019 Annual Research Report
  • [Patent(Industrial Property Rights)] 積層多孔体2021

    • Inventor(s)
      須賀一彦,森本真尋,岡崎友紀,桑田祐丞
    • Industrial Property Rights Holder
      大阪府立大学
    • Industrial Property Rights Type
      特許
    • Industrial Property Number
      2021-032788
    • Filing Date
      2021
    • Related Report
      2020 Annual Research Report

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Published: 2019-04-18   Modified: 2023-01-30  

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