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首页> 外文期刊>JSME International Journal. Series B, Fluids and Thermal Engineering >Numerical Study on Mountain Waves Generated by a Two-Dimensional Mountain and Their Effect on the Transport of Yellow Sand
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Numerical Study on Mountain Waves Generated by a Two-Dimensional Mountain and Their Effect on the Transport of Yellow Sand

机译：二维山脉产生的山浪及其对黄沙迁移影响的数值研究

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We have studied the effect of ground topography, focusing on mountain waves, on the transport of Yellow Sand by two-dimensional numerical simulation. An advection-diffusion equation for scalar concentration is solved to simulate the transport of Yellow Sand. Two different models are employed: the first is a one-layer model in which the density gradient is constant in the entire domain, and the other is a two-layer model in which the density gradient changes at an altitude of 11 km. In the both models stream lines at high altitude descend greatly toward the ground along the lee side of the mountain as the atmospheric stability increases. However, in the two-layer model, trapped mountain waves become stronger than those in the one-layer model, and rotors are also generated on the ground. These become stronger for larger mountain width, and the scalar concentration rapidly diffuses there. It is found that the ground scalar concentrations for the two-layer model are generally much larger, especially in the rotors, compared with those in the one-layer model.
机译：通过二维数值模拟，我们研究了地形对山浪的影响，重点是山波。求解了标量浓度的对流扩散方程，以模拟黄沙的迁移。使用两种不同的模型：第一种是单层模型，其中密度梯度在整个域中是恒定的，而另一种是两层模型，其中密度梯度在11 km的高度上变化。在这两个模型中，随着大气稳定性的增加，高海拔的流线沿着山的背风侧向地面大大下降。但是，在两层模型中，被困的山波比一层模型中的山波要强，并且在地面上也会产生转子。对于较大的山峰宽度，它们变得更强，并且标量浓度迅速在此处扩散。发现与两层模型相比，两层模型的地面标量浓度通常要大得多，尤其是在转子中。

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