中南大学学报（自然科学版）2016，Vol.47Issue(12)：4291-4299,9.DOI:10.11817/j.issn.1672-7207.2016.12.043
树冠流动阻力特性数值模拟与实验研究
Numerical simulation and experimental study of canopy flow resistance characteristics
摘要
Abstract
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.关键词
树冠/流动阻力/树冠阻力系数/叶面积指数Key words
canopy/flow resistance/drag coefficient of canopy/leaf area index分类
资源环境引用本文复制引用
杨会,付海明..树冠流动阻力特性数值模拟与实验研究[J].中南大学学报（自然科学版）,2016,47(12):4291-4299,9.基金项目
国家自然科学基金资助项目(41371445)(Project(41371445) supported by the National Natural Science Foundation of China) （41371445）
