The Effects of Forest Canopy Models on Damping of Turbulent Energy in a Flow
森林冠层模型对流动中湍流能量阻尼的影响
基本信息
- 批准号:09650200
- 负责人:
- 金额:$ 1.98万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (C)
- 财政年份:1997
- 资助国家:日本
- 起止时间:1997 至 1998
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
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.
本研究主要包括三个部分:(1)中型风洞实验研究;(2)大型风洞实验研究;(3)有限差分法数值模拟研究。(1)本试验中的冠层模型的叶面积指数为6.6。用CTA测量了树木模型下游区域的流向速度分布,发现单个树木模型之间的流动不同于树木下游的流动。冠层模型下游流场表现出较强的三维特征。(2)该试验是在1998年1月于宫崎大学建造的大型风洞中进行的。冠层模型的叶面积指数为9.0。从单树模型的排列角度,分析了不同节距下冠层剪切层内湍流时均速度和湍流强度的分布。(3)采用FDM-SMAC方法对流场进行了数值模拟。冠层由大量的质点近似,质点之间通过弹簧和阻尼器连接。在时间推进中,气流的运动和树冠中颗粒的运动是联系在一起的。数值计算了各种稀疏和密集树冠的绕流场。这些结果与风洞试验结果吻合较好。
项目成果
期刊论文数量(7)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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)
HIRANO、Kimitaka、KIKUCHI Masanori:“植物冠层模型下游区域流向速度三维分布的测量”宫崎大学工学部回忆录第28期。
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- 影响因子:0
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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.
YAMASHITA, Y.、HIRANO, K.、KIKUCHI, M.、BUNRIN, H.:“森林冠层模型周围流场湍流结构的测量”论文集,1998 年日本流体力学学会会议。
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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)
平野菊池:“森林冠层模型下游区域流向速度的三维分布结构”宫崎大学工学部通报28。(1999)。
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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)
Yamashita、Hirano、Kikuchi、Bunbayashi:“森林冠层模型周围流场中湍流结构的测量”日本流体力学学会年会 98 论文集(1998 年)。
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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)
Yuichi Yamashita:“通过森林冠层模型的气流速度场的测量”宫崎大学工程学院通报 26. 169-175 (1997)。
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HIRANO Kimitaka其他文献
HIRANO Kimitaka的其他文献
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{{ truncateString('HIRANO Kimitaka', 18)}}的其他基金
Research on the Windbreak Function of Forest Canopies under Strong Wind Flows with the Turbulent Wind Tunnel and the Towing Wind Tunnel
湍流风洞与拖曳风洞强风流下森林冠层防风功能研究
- 批准号:
13650188 - 财政年份:2001
- 资助金额:
$ 1.98万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
The Effect of Large-Scaled Eddies in the Wind Flows on the Windbreak of Forest Canopies
风流中的大尺度涡流对森林冠层防风的影响
- 批准号:
11650182 - 财政年份:1999
- 资助金额:
$ 1.98万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
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