Simulation analysis of the influencing factors on the wind environment around the hilly terrain

Abstract

The wind environment condition of hilly terrain is closely related to wind resources utilization. In this paper, based on Fluent numerical simulation method, the wind flow characteristics around the hill topography under the influence of varied slopes, incoming wind speeds, heights and roughness are analyzed and summarized. It can be drawn that for the range from the hillside to the top on the windward side, the slope has a significant effect on the wind speed. Within the 100m height above the ground, when the hill is steeper, the wind speed is significantly enhanced. At the top of the hill, the wind speed’s maximum increment is 1.5 times of the incoming value. When the wind goes across the hilltop, the factors including the slope, height and roughness, have great influence on the wind environment on the leeward side. When the slope is greater than or equal to 0.5, the phenomenon of eddies present and the range of influence extends downstream. The wind speed weakness trend can also be found when the height and roughness increase.