Liu Benli, Qu Jianjun, Zhang Weimin, Tan Lihai, Gao Yanhong
Dunhuang Gobi Desert Ecological and Engineering Research Station, Key Laboratory of Desert and Desertification, Chinese Academy of Sciences, Lanzhou 730000, China.
1] Dunhuang Gobi Desert Ecological and Engineering Research Station, Key Laboratory of Desert and Desertification, Chinese Academy of Sciences, Lanzhou 730000, China [2] Gansu Center for Sand Hazard Reduction Engineering and Technology, Lanzhou 730000, China.
Sci Rep. 2014 Oct 14;4:6619. doi: 10.1038/srep06619.
The airflow field around wind fences with different porosities, which are important in determining the efficiency of fences as a windbreak, is typically studied via scaled wind tunnel experiments and numerical simulations. However, the scale problem in wind tunnels or numerical models is rarely researched. In this study, we perform a numerical comparison between a scaled wind-fence experimental model and an actual-sized fence via computational fluid dynamics simulations. The results show that although the general field pattern can be captured in a reduced-scale wind tunnel or numerical model, several flow characteristics near obstacles are not proportional to the size of the model and thus cannot be extrapolated directly. For example, the small vortex behind a low-porosity fence with a scale of 1:50 is approximately 4 times larger than that behind a full-scale fence.
不同孔隙率防风网周围的气流场对于确定防风网作为防风设施的效率至关重要，通常通过缩尺风洞实验和数值模拟来研究。然而，风洞或数值模型中的尺度问题很少被研究。在本研究中，我们通过计算流体动力学模拟对缩尺防风网实验模型和实际尺寸的防风网进行了数值比较。结果表明，尽管在缩尺风洞或数值模型中可以捕捉到一般的流场模式，但障碍物附近的几个流动特性与模型尺寸不成比例，因此不能直接外推。例如，孔隙率低的1:50缩尺防风网后面的小涡旋比全尺寸防风网后面的小涡旋大约大四倍。
