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In this study, characteristics of fluctuating lift and spatial correlation for cylinder were experimentally investigated by wind tunnel testing. For rectangular cylinder, drag coefficient was almost constant, but fluctuating lift changed with wind speed. The total fluctuating force was between linear summation and square summation of both fluctuating lift forces at supports. In higher wind speed region, fluctuating lift forces at support was fully correlated to each other. Rectangular cylinder with spanwise varying section was employed to reduce fluctuating lift. Openings were more effective rather than appendages. Evaluation method of windward correlation length was also proposed.
