Wind characteristics generated by the wind tunnel named Desert Environment Wind Tunnel, which can generate arbitrary pattern of wind speed variation by changing the angle of pitch of the blower blades, were investigated with both of a hot-wire anemometer and a ultrasonic anemometer. Distributions of the wind velocity components (v, w) in a plane perpendicular to the mainstream (u-direction), whose wind speed varies like a sine wave, were measured downstream at x = 1.5m from the exit of wind tunnel nozzle. The experimental results revealed that the flow expands when it accelerates and, in reverse, the flow contracts then slowing down
