VORTEX-INDUCED OSCILLATORY RESPONSE OF A CIRCULAR-CYLINDER DUE TO INTERFERENCE EFFECTS

The oscillatory response of a spring mounted circular cylinder (test cylinder, diameter D) due to the presence of a rigid circular cylinder (interfering cylinder, diameter d) are presented in this paper. Ratios of d/D = 0.5, 1.0, 1.5 and 2.0 have been utilized for this purpose. Various relative positions of the test cylinder and the interfering cylinder in the tandem, side-by-side and the staggered arrangements are considered. The results show that under certain combinations of d/D ratio and the relative position, the test cylinder can experience oscillatory amplitudes nearly three times those observed for the no-interfering case. Under certain other conditions the vibrations are completely suppressed. The observed features are discussed with reference to earlier related studies.