Numerical and experimental study of the aerodynamic characteristics around two-dimensional terrain with different slope angles
Numerical and experimental study of the aerodynamic characteristics around two-dimensional terrain with different slope angles
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不同坡度二维地形气动特性数值与实验研究
DOI：
10.1007/s11707-019-0790-8
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发表时间：
2019-11
影响因子：
2
通讯作者：
Tang Shengming
中科院分区：
文献类型：
--
作者：
Fang Pingzhi;Zheng Deqian;Li Liang;Ma Wenyong;Tang Shengming
上海台风研究所开发的台风动态降尺度模型和参数风场模型将复杂地形考虑并简化为二维（2D）地形。二维地形进一步建模为上坡和下坡段，相对于流入流具有不同的坡度角度。本研究对二维地形周围的风速比和压力特征进行了数值和实验研究。首先在具有剪切传入流的风洞中研究了具有有限长度上表面的二维地形的空气动力学特性。还使用商用计算流体动力学代码 FLUENT 和 realizedk-ε 湍流模型进行了相应的数值研究。我们付出了特别的努力来维持整个计算域的流入边界条件。然后，通过使用均匀传入流的数值方法，研究具有无限长度上表面的理想二维地形的空气动力特性。上述研究中不同地形模型和来流的比较表明，风压系数和风速比均受到坡度角的影响。对于坡度为40°和30°的上坡和下坡地形模型，风压系数在发生流分离的陡坡点处存在负峰值。相应地，上坡地形模型中陡坡点以上各点的流向风速比随着坡度角的增大而增大，在坡度角α=40°时达到峰值，并随着坡度角的进一步增大而减小。对于下坡地形模型，除了临界坡角 isa= 30° 外，陡坡点上方的点也存在类似的趋势。
Complicated terrain was considered and simplified as two-dimensional (2D) terrain in a dynamical downscaling model and a parametric wind field model for typhoons developed by the Shanghai Typhoon Institute. The 2D terrain was further modeled as uphill and downhill segments with various slope angles relative to the incoming flow. The wind speed ratios and pressure characteristics around the 2D terrain were numerically and experimentally investigated in this study. Aerodynamic characteristics of the 2D terrain with a limited-length upper surface were first investigated in the wind tunnel with sheared incoming flow. The corresponding numerical investigation was also conducted by using the commercial computational fluid dynamics code FLUENT with the realizablek-εturbulence model. Special efforts were made to maintain the inflow boundary conditions throughout the computational domain. Aerodynamic characteristics were then investigated for the ideal 2D terrain with an unlimited-length upper surface by using a numerical method with uniform incoming flow. Comparisons of the different terrain models and incoming flows from the above studies show that the wind pressure coefficients and the wind speed ratios are both affected by the slope angle. A negative peak value of the wind pressure coefficients exists at the escarpment point, where flow separation occurs, for the uphill and downhill terrain models with slope angles of 40° and 30°, respectively. Correspondingly, the streamwise wind speed ratios at the points above the escarpment point for the uphill terrain model increase with increasing slope angle, reach their peak values at the slope angle ofα= 40° and decrease when the slope angle increases further. For the downhill terrain model, similar trends exist at the points above the escarpment point with the exception that the critical slope angle isa= 30°.
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影响因子：
3
作者：
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通讯作者：
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影响因子：
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作者：
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影响因子：
2.2
作者：
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通讯作者：
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