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A fundamental study on the estimation of fluxes in boundary layers of rotating fluids by laboratory experiments

Research Project

Project/Area Number 17K05653
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Meteorology/Physical oceanography/Hydrology
Research InstitutionThe University of Tokyo

Principal Investigator

Iga Keita  東京大学, 大気海洋研究所, 准教授 (60292059)

Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2019: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2017: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Keywords渦の室内実験 / 渦運動に伴う境界層 / 境界層内の運動量輸送 / 層流境界層・乱流境界層 / 円筒容器内の流れ / 軸対称渦 / 非軸対称な渦 / 流体 / 気象学 / 海洋物理
Outline of Final Research Achievements

In a cylindrical container filled with water driven by a rapidly rotating bottom disk, a vortex motion is formed in a laboratory experiment. Considering the angular momentum exchange through the boundary layers, and comparing the theoretical calculation and the experimental results, the flow features of the boundary layers are investigated.
The detailed measurements of the change of the surface elevation indicate that the momentum exchange between the fluid and the bottom or side-wall boundaries is proportional to the velocity difference, which indicates that the flow in the boundary layer is laminar. On the other hand, the flow at the free surface has also turbulent features; both laminar and turbulent boundary layers are formed in the same system with the same surrounding flow parameter.

Academic Significance and Societal Importance of the Research Achievements

室内実験によって境界層の性質を解析し、そこを通して行われる運動量輸送の評価を行ったが、室内実験の測定結果を通じて、境界層の素過程の性質を示すことができた。これは、地球流体の数値計算を行う際に必要となるパラメタリゼーションが数値実験を通して行われることが多い中、スケール間相互作用を測定できる室内実験の手法を用いた輸送量評価となっており、数値計算で用いるパラメタリゼーションの根拠づけとしての役割も果たす。

Report

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

    (13 results)

All 2019 2018 2017

All Journal Article (2 results) (of which Peer Reviewed: 2 results) Presentation (11 results) (of which Int'l Joint Research: 2 results)

  • [Journal Article] Axisymmetric flow in a cylindrical tank over a rotating bottom. Part I. Analysis of boundary layers and vertical circulation2017

    • Author(s)
      Iga Keita
    • Journal Title

      Fluid Dynamics Research

      Volume: 49 Issue: 6 Pages: 065502-065502

    • DOI

      10.1088/1873-7005/aa8bef

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] Axisymmetric flow in a cylindrical tank over a rotating bottom. Part II. Deformation of the water surface and experimental verification of the theory2017

    • Author(s)
      Iga Keita、Yokota Sho、Watanabe Shunichi、Ikeda Takashi、Niino Hiroshi、Misawa Nobuhiko
    • Journal Title

      Fluid Dynamics Research

      Volume: 49 Issue: 6 Pages: 065501-065501

    • DOI

      10.1088/1873-7005/aa8bf0

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Presentation] Axisymmetric Flows and Non-Axisymmetric Phenomena in a Cylindrical Tank with a Rotating Bottom Filled with Water2019

    • Author(s)
      Iga K.
    • Organizer
      International Union of Geodesy and Geophysics XXVII General Assembly
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 円筒水槽底面の回転円盤上に生じる流れの上を伝播する波の共鳴2019

    • Author(s)
      伊賀 啓太
    • Organizer
      日本流体力学会年会2019
    • Related Report
      2019 Annual Research Report
  • [Presentation] 円筒容器内の回転円盤上の流れの上を伝播する波の共鳴2019

    • Author(s)
      伊賀 啓太
    • Organizer
      日本気象学会2019年秋季大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 円筒水槽内の回転する底面上の軸対称流の波の共鳴2019

    • Author(s)
      伊賀 啓太
    • Organizer
      九州大学応用力学研究所研究集会
    • Related Report
      2018 Research-status Report
  • [Presentation] 底面が回転する円筒容器内の軸対称流: 速い流れと遅い流れの場合の比較2018

    • Author(s)
      伊賀 啓太
    • Organizer
      日本地球惑星科学連合2018年大会
    • Related Report
      2018 Research-status Report
  • [Presentation] Sloshing phenomena on a water in a cylindrical tank over a rotating bottom2018

    • Author(s)
      Iga K.
    • Organizer
      5th International Conference on Experimental Fluid Mechanics
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] 円筒水槽底面の回転円盤上に生じる軸対称流: 速い流れと遅い流れ2018

    • Author(s)
      伊賀 啓太
    • Organizer
      日本流体力学会年会2018
    • Related Report
      2018 Research-status Report
  • [Presentation] 円筒容器内で回転する円盤上の軸対称流: 速い流れと遅い流れの比較2018

    • Author(s)
      伊賀 啓太
    • Organizer
      日本気象学会2018年秋季大会
    • Related Report
      2018 Research-status Report
  • [Presentation] 円筒水槽内の回転する底面上の軸対称流: 速い流れと遅い流れ2018

    • Author(s)
      伊賀 啓太
    • Organizer
      東京大学大気海洋研究所研究集会
    • Related Report
      2017 Research-status Report
  • [Presentation] 円筒水槽底面の回転円盤上に生じる軸対称流とその浅水系としての安定性2017

    • Author(s)
      伊賀 啓太
    • Organizer
      日本流体力学会年会2017
    • Related Report
      2017 Research-status Report
  • [Presentation] 円筒容器内で回転する円盤上の軸対称流の不安定2017

    • Author(s)
      伊賀 啓太
    • Organizer
      日本気象学会2017年秋季大会
    • Related Report
      2017 Research-status Report

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

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