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Studies on the mechanism of 'honami' (plant waving) generation and the exchange processes of matter and energy caused by it, considering a large deflection of plant stalk.

Research Project

Project/Area Number 10650513
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 水工水理学
Research InstitutionChuo University

Principal Investigator

HINO Mikio  Chuo University, Faculty of Policy Studies, Professor, 総合政策学部, 教授 (30016323)

Project Period (FY) 1998 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 1999: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1998: ¥2,900,000 (Direct Cost: ¥2,900,000)
KeywordsHonami / Plant waving by wind / LES turbulence model / 3D-Numerical Simulation / Oscillation of elastic plant / Spectrum / Wavelet / 穂波 / 乱流 / 流体力学的不安定 / 大変形
Research Abstract

Aims: 'Honami' (plant waving) is a well-known phenomenon observed in paddy and wheat fields, The phenomenon is interesting not only from the view point of fluid mechanics but also from a practical view of environment and food production, since the plant waving may contribute considerably to accelerate the exchange of matter (COィイD22ィエD2 and OィイD22ィエD2), heat and energy. In order to shed a light on the phenomenon of 'honami', a three dimensional numerical simulation considering large deflection of plant stalk has been performed.
Means: Three-Dimensional turbulent flow above and within a canopy layer has been computed numerically applying LES turbulence model of Kanda and Hino (1994). The waving oscillation of plant stalk has been simulated by rows of elastic cylinders.
Results: At the initial stage of turbulent canopy flow development, a street of periodic longitudinal vortices has been generated caused by the inflectional point flow instability mechanism. At the initial stage, the correlation between the periodicity of vortex and the frequency of plant oscillation is low. As time steps go on, the periodicity of longitudinal vortices gradually changes and becomes a little irregular, and the periodicity approaches to the natural frequency of plant stalk oscillation.
Within a limited range of this simulation, the results seem to support the gust-attack and/or resonance theory of 'honami' generation, although the conclusion does not exclude the possibility of other mechanisms.

Report

(3 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report
  • Research Products

    (20 results)

All Other

All Publications (20 results)

  • [Publications] 日野幹雄: "大変形をする穗波の数値シミュレーション"第12回数値流体シンポジウム. 403-404 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 日野幹雄: "大変形を考慮した植生境界層流の不安定化と穗波発生機構に関する数値シミュレーション"水工学論文集. 43. 803-808 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 日野幹雄: "大変形を考慮した穗波の数値シミュレーション(4)"日本流体力学会年会論文集. 515-516 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 日野幹雄: "穗波とキャノピー・フローの数値シミュレーションとウェブレット解析"第13回数値流体力学シンポジウム論文要旨集. 177 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 日野幹雄・葛生和人: "風に戦ぐ稲保(穗波)の数値シミュレーションとアニメ表現"第14回生研NSTシンポジウム講演論文集. 103-107 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 日野幹雄: "特別講演'風と波のゆらぎ'"ゆらぎシンポジウム. vol.12. 31-41 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Hino, M.: "Numerical simulation of 'Honami' with large defilection"Proc. 12th Symp.on Computer Fluid Dynamics, JSCFD. 403-404 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Hino, M.: "Numerical simulation on the instability of canopy flow and the generation mechanism of 'honmi' ( plant waving ), considering large deflection of plant stalk"Annual J.on Hydraulic Eng., JSCE. Vol.43. 803-808 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Hino, M.: "Numerical simulation on 'Honami' (plant waving), considering large deflection of plant stalk (4)"Proc. '99 Annual Conference on Fluid Mechanics, JSFM. 515-516 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Hino, M.: "Numerical simulation and wavelet analysis on ' Honami' and canopy flow"Proc. 13th symp on Comp. Fluid Dynamics, JSCFD. 177 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Hino, M. and Kuzuu, K.: "Numerical simulation and animation of waving plant (' Honami ' )"Proc. 14th Symp.on Numerical Simulation of Turbulence, Inst. Industrial Science, Tokyo University. 103-107 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Hino, M.: "Special Lecture: 'Fluctuations in Wind and Wave'"Proc. Sym on 'Yuragi (Fluctuations)' Phenomena. Vol.12. 31-41 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 日野 幹雄: "大変形を考慮した植生境界層流の不安定化と穂波発生機構に関する数値シミュレーション"水工学論文集. 43. 803-808 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 日野 幹雄: "大変形を考慮した穂波の数値シミュレーション(4)"日本流体力学会年会論文集. 515-516 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 日野 幹雄: "穂波とキャノピー・フローの数値シミュレーションとウェブレット解析"第13回数値流体力学シンポジウム論文要旨集. 177 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 日野 幹雄、葛生 和人: "風に戦ぐ稲穂(稲波)の数値シミュレーションとアニメ表現"第14回生研NSTシンポジウム講演論文集. 103-107 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 日野 幹雄: "大変形を考慮した植生群と大気流との相関場" 第12回数値流体力学シンポジウム講演論文集. 12. 403-404 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 日野幹雄・葛生和人: "風に戦ぐ稲穂(穂波)の数値シミュレーションとアニメ表現" 第14回生研NSTシンポジウム講演論文集. 14. 103-107 (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] 日野 幹雄: "大変形を考慮した植生境界層流の不安定化と穂波発生機構に関する数値シミュレーション" 水工学論文集. 第43巻. 803-808 (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] 日野 幹雄: "特別講演“風と波のゆらぎ"" ゆらぎ現象研究会. 12. 31-41 (1998)

    • Related Report
      1998 Annual Research Report

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Published: 1998-04-01   Modified: 2016-04-21  

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