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SHIFT IN VORTEX SHEDDING MODE FOR FLOWOVER STREAMWISE OSCILLATING CYLINDER UNDER CONSTANT CONDITIONS

Ahmad Elhares
Department of Mechanical Engineering, University of California Merced, Merced, CA 95343, USA

Krishna Shah
Department of Mechanical Engineering, University of California Merced, Merced, CA 95343, USA

Yanbao Ma
Department of Mechanical Engineering, University of California Merced, Merced, CA 95343, USA

DOI: 10.1615/TFEC2020.fnd.032029
pages 343-349

Abstract

Flow over a cylinder has attracted a lot of interest in the past few decades due to resulting complex flow phenomenon as well as its implications on a wide variety of natural and engineering systems. The present work examines experimental laminar flow over a streamwise oscillating cylinder. Vertical soap film flow has been used as the experimental apparatus to obtain laminar flow over the oscillating cylinder. Experimental flow visualization of resulting vortex street has been used to study the vortex shedding mode. Two vortex shedding modes are observed at the same frequency and amplitude of the cylinder oscillation. The first vortex shedding mode is symmetric and consists of a pair of vortices with different rotation directions being shed per oscillation cycle in simultaneous fashion. The second mode is asymmetric and consists of three vortices with the same rotation direction being shed from one side of the cylinder which alternates every oscillation cycle. Snapshots of the flow are taken to visualize the vortex shedding modes and the cylinder position at the moment of vortex detachment.

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