连续山坡地形下风场的数值模拟

Numerical simulation of wind field in the continuous hillside topography

为了研究复杂地形条件下连续山坡对近地面风场分布的影响，采用计算流体力学（CFD），基于商用软件Fluent 6．3平台，模拟了迎风方向上相邻两座山的风场分布情况，具体分析了山间距和上游山高度两种因素对下游山迎风坡、坡顶、背风坡和山一侧近地面50m高度内风速的影响。结果表明，山间距和上游山高度对下游山风速均有显著影响；山间距为1．25—1．75倍下游山高度时，上游山对下游山近地面部分区域风场有加速作用；上游山高度小于下游山高度时，下游山近地面风场受到的影响较小。

In order to study the influence of hillside to boundary layer wind distribution under the complex terrain conditions, the computational fluid dynamics （CFD） technology is used to simulate the wind field of two adjacent mountains in the upwind direction based on commercial software platform Fluent 6.3. The influences of the mountain height in upstream and distance between two mountains on wind speed at the height of 50 meter from the ground are analyzed. The experiments show that both the height and distance have significant effect on the wind speed in downstream mountain. The upstream hill could accelerate wind speed near the ground part in the downstream hill when the distance is 1.25 to 1.75 times of the height of downstream hill. However, when the height of upstream hill is less than that of downstream hill, wind field near the ground in downstream hill is less affected by upstream hill.