The fluctuating pressures on the surface of two circular cylinders of the same diameter in tandem arrangement were measured in the upper subcritical regime to obtain the distributions of their rms values and the spanwise and circumferential correlations. These pressures were subsequently integrated to yield the spanwise correlation length and the rms values of fluctuating lift and drag as functions of the spacing between the two cylinders. The rms lift and drag were much larger for the downstream cylinder than for the upstream cylinder up to the spacing of 7.0 diameters. At the spacing of 10.0 diameters, they were different from those for a single cylinder by only a small amount.

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