Disturbed Wind Fields around the Obstacle in Sheared Flow near the Ground Surface

[摘要] Wind distribution in the neighborhood of an obstacle near the ground surface was measured. In the present study there are used a circular cylinder, a square pillar, the Marine Tower of our Institute, and a model of the tower which is reduced on the scale of one to twelve. Wind decrement on the windward side and wind increment on the transverse side of the obstacle are noted. The distribution of wind velocity around a square pillar corresponds to that around a circular cylinder with a diameter from 1.55 to 1.6 times as large as the side length of the square. At some height above the ground surface the wind pattern on the windward side of the circular cylinder is almost represented by the potential solution for an ideal inviscid fluid, but in the layer close to the ground surface the effect of an obstacle in the wind field is considerably greater than that predicted by the potential solution.

[学科分类] 大气科学