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The Effects of Forest Canopy Models on Damping of Turbulent Energy in a Flow

Research Project

Project/Area Number 09650200
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Fluid engineering
Research InstitutionMiyazaki University

Principal Investigator

HIRANO Kimitaka  Miyazaki University, Department of Mechanical Systems Engineering, professor, 工学部, 教授 (40094081)

Project Period (FY) 1997 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥3,100,000 (Direct Cost: ¥3,100,000)
Fiscal Year 1998: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1997: ¥1,600,000 (Direct Cost: ¥1,600,000)
Keywordsplant canopy / wind tunnel testing / finite difference method / turbulent energy / leaf area index / effect of wind break / 植生流体力学 / 森林キャノピ- / エネルギー減衰 / 乱れ / 環境流体力学
Research Abstract

This research is composed of three parts ; (1) the first is the experiments with the medium wind tunnel, (2) the second is that with the large wind tunnel, and (3) the third is the numerical simulation with the finite difference method and the crown-particle dynamics like the molecular dynamics.
(1) The canopy model in this testing has the leaf area index of 6.6. Distributions of streamwise velocity components in the downstream region of the model are measured with the CTA.Flows between individual tree models are different from flows downstream of trees. Flows downstream of the canopy models showed strong three-dimensional characteristics.
(2) This testing is experimented with the large wind tunnel constructed in Miyazaki University on January 1998. The canopy model has the leaf area index of 9.0. Distributions of the time-averaged velocity and intensity of turbulence in the shear-layer above the canopy are changed with the different pitch from arrangement of individual tree models.
(3) Flow fields are simulated with the FDM-SMAC method. The crowns of canopy are approximated with a lot of particles that are connected with neighbor particles by spring and damper. The motion of air flows and the motion of particles in the crown are linked in the time-marching. Flow fields around the canopies of various sparse and dense crowns are calculated numerically. These results are good agreement with the results of the experiments with the wind tunnel testing.

Report

(3 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report

Research Products

(7 results)

All Other

All Publications (7 results)

  • [Publications] 平野,菊地: "森林キャノピー模型下流域における流れ方向速度の三次元分布構造" 宮崎大学工学部研究紀要. 28. (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 山下,平野,菊地,分林: "森林キャノピー模型まわりの流れ場における乱れ構造の測定" 日本流体力学会年会'98講演論文集. 279-280 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] HIRANO,Kimitaka, KIKUCHI Masanori: "Measurement of Three-dimensional Distributions of the Streamwise Velocities at Downstream Regions of the Plant Canopy Models" Memoirs of the Faculty of Engineering, Miyazaki University.No.28. (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] YAMASHITA, Y., HIRANO, K., KIKUCHI, M., BUNRIN, H.: "Measurement of the Turbulence Structure in Flow Fields around Models of Forest Canopies" Proceedings, 1998 Meeting of Japan Society of Fluid Mechanics.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 平野,菊地: "森林キャノピー模型下流域における流れ方向速度の三次元分布構造" 宮崎大学工学部研究紀要. 28. (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] 山下,平野,菊地,分林: "森林キャノピー模型まわりの流れ場における乱れ構造の測定" 日本流体力学会年会'98講演論文集. 279-280 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 山下祐一: "森林キャノピ-模型を通過する気流の速度場の測定" 宮崎大学工学部紀要. 26. 169-175 (1997)

    • Related Report
      1997 Annual Research Report

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Published: 1997-03-31   Modified: 2016-04-21  

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