Turbulence-Induced Vibrations of a Circular Cylinder in Cross Flow at Supercritical Reynolds Numbers.

Abstract

Turbulence-induced vibrations of a circular cylinder were measured in a water cross flow at supercritical Reynolds numbers. Turbulence intensities of the incoming flow were varied from 1% to 13% in order to investigate the effect on the power spectra of fluctuating forces. The power spectra of the fluctuating lift above the Strouhal number agreed with those of the fluctuating drag. Normalized spectra of the fluctuating lift above the Strouhal number were independent of Reynolds numbers and moved toward higher frequency with increasing turbulence intensity. Empirical expressions of the normalized spectra of the fluctuating lift for each turbulence intensity were given to estimate the displacement due to turbulence-induced vibration. The calculated displacement agreed with the measured one with a standard deviation of 30%.