Pressure Fluctuations on the Surface of Two Circular Cylinders in Tandem Arrangement*

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  • Pressure Fluctuations on the Surface of

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The fluctuation pressures on the surfaces of two circular cylinders of the same diameter in a tandem arrangement were measured in the subcritical region in order to obtain the distributions, of the their r.m.s. values of lift and drag coefficient as a function of the spacing between the two cylinders. The spacing ranged from 2.0 to 6.0 diameters. Also, the time historys of the fluctuating lift and drag coefficients could be obtained by a conditional sampling technique. The results strongly suggested that the r.m.s. pressure and the r.m.s. lift force incaeased in a ste-plike manner at the critical spacing where vortex shedding will just occur from the upstream cylinder. The r.m.s. value of the fluctuating lift coefficient was much larger than that of the drag coefficient for the upstream and downstream cylinders.

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