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The drag and lift forces acting on a circular cylinder shaped model near a plane have been measured in a water tunnel. The Reynolds number varies from 4.0×103 to 1.5 ×10s, the gaps between the cylinder and the plane boundary being from 0.2D to 3.0D (Diameters of the cylinder). The DD, CL as well as the response frequency have been determined. The results show that when the ratio of the gap to the cylinder diameter H/ D> 1.0, the influence of the plane boundary can be neglected while 0.2 < H/ D < 1.0, the value of drag becomes larger as H / D decreases, the time-averaged lift force is not equal to zero, a net lift force, which is away from the wall, appears.
The drag and lift forces acting on a circular cylinder shaped model near a plane have been measured in a water tunnel. The Reynolds number varies from 4.0 × 103 to 1.5 × 10s, the gaps between the cylinder and the plane boundary being from 0.2D to 3.0D (Diameters of the cylinder). The DD, CL as well as the response frequency have been determined. The results show that when the ratio of the gap to the cylinder diameter H / D> 1.0, the influence of the plane boundary can be neglected while 0.2
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