Abstract
This paper was concerned with the wind flow around a circular cylinder with various wind velocities (ν) and turbulence intensities (I). Wind pressures were measured through wind tunnel tests, by which drag coefficient (CD ) and lift coefficient (C L) were calculated. The values of drag coefficient varies with the Reynolds numbers (Re) and turbulence intensities of incoming flow, and there exists a significant difference between steady flow and turbulent flow in drag coefficient in subcritical Reynolds numbers. An unstable separation bubble appears on one side when flow changes from the steady situation to the turbulent situation. Turbulence intensity affects the spectral density distribution of drag coefficient a lot.
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