Numerical simulation and experimental study of canopy flow resistance characteristics

被引：0
|
作者：
Yang H. [1 ,2 ]
Fu H. [1 ]
机构：
[1] School of Environmental Science and Engineering, Donghua University, Shanghai
[2] Department of Building Environment and Energy Engineering, Guilin University of Aerospace Technology, Guilin
来源：
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2016年 / 47卷 / 12期
基金：
中国国家自然科学基金;
关键词：
Canopy; Drag coefficient of canopy; Flow resistance; Leaf area index;
D O I：
10.11817/j.issn.1672-7207.2016.12.043
中图分类号：
学科分类号：
摘要：
Computational fluid dynamics (CFD) and field experiments were used to investigate the flow characteristics and flow resistance through vegetation canopies with several typical morphological characteristics. The leaf area index (LAI), solid volume fraction (SVF) and the fractal dimension (Df) were used to analyze the complicated morphology of vegetation canopy. The influences of leaf area index, solid volume fraction and fractal dimension on flow resistance were studied. The results show that leaf area index approximately has linear relationship with solid volume fraction, and the fractal dimension of canopy has logarithmic relationship with leaf area index and solid volume fraction, respectively. A model expression between the drag coefficient of the canopy and leaf area index was presented by analyzing simulation results. The model expression was validated using experimental results in a wind tunnel with four kinds of tree branches. The results show that the simulation results from 2D simplified model are slightly larger than experimental results, and can qualitatively predict the trend of the relationship between the drag coefficient of the canopy and leaf area index. However, the results obtained by using the proposed 2D simplified canopy model show good agreement with the experimental results after modifying the simulation results with a correction factor. © 2016, Central South University Press. All right reserved.
引用
收藏
页码：4292 / 4300
页数：8
相关论文
共 31 条
  • [1] Cao J., Tamura Y., Yoshida A., Wind tunnel study on aerodynamic characteristics of shrubby specimens of three tree species, Urban Forestry & Urban Greening, 11, pp. 465-476, (2012)
  • [2] Sanz R.J., van Beeck J., Dezso W.G., Wind tunnel simulation of the wind conditions inside bidimensional forest clear-cuts. Application to wind turbine siting, Journal of Wind Engineering and Industrial Aerodynamics, 95, pp. 609-634, (2007)
  • [3] Molina-Aiz F.D., Valera D.L., Alvarez A.J., Et al., A wind tunnel study of airflow through horticultural crops: determination of the drag coefficient, Biosystems Engineering, 93, 4, pp. 447-457, (2006)
  • [4] Duman T., Katul G.G., Siqueira M.B., Et al., A velocity-dissipation lagrangian stochastic model for turbulent dispersion in atmospheric boundary-layer and canopy flows, Boundary Layer Meteorology, 152, pp. 1-18, (2014)
  • [5] Irvine M.R., Gardiner B.A., Hill M.K., The evolution of turbulence across a forest edge, Boundary Layer Meteorology, 84, 3, pp. 467-496, (1997)
  • [6] Novak M.D., Warland J.S., Orchansky A.L., Et al., Wind tunnel and field measurements of turbulent flow in forests. Part I: uniformly thinned stands, Boundary Layer Meteorology, 95, 3, pp. 457-495, (2000)
  • [7] Guan D., Zhu T., Wind tunnel experiment on canopy structural parameters of isolated tree and wind velocity field characters nearby, Chinese Journal of Applied Ecology, 11, 2, pp. 202-204, (2000)
  • [8] Zeng P., Takahashi H., A first-order closure model for the wind flow within and above vegetation canopies, Agricultural and Forest Meteorology, 103, pp. 301-313, (2000)
  • [9] Siqueira M., Katul G., Tanny J., The effect of the screen on the mass, momentum, and energy exchange rates of a uniform crop situated in an extensive screen house, Boundary Layer Meteorology, 142, 3, pp. 339-363, (2012)
  • [10] Sogachev A., Panferov O., Modification of two-equation models to account for plant drag, Boundary Layer Meteorology, 121, 2, pp. 229-266, (2006)
1234