The vortex shedding phenomena usually occurs in flow induced vibration of bluff bodies. It consists typically of a pattern of swirling vortices in alternating directions. This paper presents an empirical study for the suppression of vortices shedding behind a circular cylinder. Experiments were conducted in a small duct using the passive control approach of vortex shedding by fixing a splitter plate behind a circular cylinder. This study investigated two cases: one with and one without splitter plate. The flow velocity range is 0.2 to 3.2 m/sec (2200< R_e<12600). The equation of motion is formulated using a mass spring system. The experimental and mathematical results gave the same critical speed (U_(VIV)= 1.1 m/sec at S_t= 1.8) of vortex-induced vibration (VIV). In addition, the effect of an attached the splitter plate on disappearance of vortex shedding and variation of Strouhal number are analyzed. Furthermore, the flows in both cases are simulated numerically using FLUENT software package.
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