Numerical simulation of wind flow over transverse and pyramid dunes
Numerical simulation of wind flow over transverse and pyramid dunes
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DOI：
10.1016/j.jweia.2011.06.007
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发表时间：
2011-08-01
影响因子：
4.8
通讯作者：
Qian, Guangqiang
中科院分区：
文献类型：
--
作者：
Liu, Benli;Qu, Jianjun;Qian, Guangqiang
通过风洞实验和计算流体力学（CFD）模拟了一个尺度的横向沙丘模型，在此基础上，采用一种经过验证的数值方法对一个全尺寸金字塔沙丘的流动特性进行了评价。通过比较相同网格方法和流动条件下的二维和三维（2D和3D）模型的计算结果，分析了CFD模拟的尺寸效应。风洞测量结果与二维和三维剖面CFD结果吻合良好，证明简化的数值模型可以模拟沙丘的剖面流型。然而，即使是简单的横向沙丘，流场的横向不均匀性也很明显，需要三维模拟来捕捉沙丘峰顶线后流型的横向不均匀性。利用敦煌明沙沙丘东麓金字塔沙丘的地形调查资料，建立了数值几何模型。三种进口气流方向下的金字塔沙丘流场差异显著，不同垂直平面上的流型横向差异较大。逆流带的位置、形状和大小随沙丘地形的变化而变化。(C) 2011 Elsevier Ltd.版权所有。
Wind tunnel experiment and computational fluid dynamics (CFD) simulation of the flow past a scaled transverse dune model were performed, after which a validated numerical method was used to evaluate the flow characteristics over a full-scale pyramid dune. The dimensional effect of the CFD simulation was analyzed by comparing the results of two- and three-dimensional (2D and 3D) models with the same mesh method and flow condition. There was excellent agreement between the wind tunnel measurements and the 2D and 3D sectional CFD results, proving that the simplified numerical model could simulate the sectional flow pattern of dunes. However, the lateral inhomogeneity of the flow field is significant although with simple transverse dunes, and 3D simulation is required to capture the lateral inhomogeneity of flow patterns after the dune crest line. Survey data of the topography of a pyramid dune, located at the eastern foot of the Mingsha Megadune, Dunhuang, China, were used to build numerical geometry. The flow fields over this pyramid dune under three inlet flow directions are significantly different from each other, and the lateral variances of flow patterns at different vertical planes are profound. The location, shape, and magnitude of the reverse flow zone change corresponding to the dune topography. (C) 2011 Elsevier Ltd. All rights reserved.