FLOW CONTROL THROUGH VORTEX SHEDDING INTERACTION OF ONE CYLINDER DOWNSTREAM OF ANOTHER

Abstract

This study investigates the vortices produced between two 2d cylinders, and the relationship
between the structures of the vortices produced at both cylinders when one is placed in the wake flow of
another. CFD simulations using ANSYS Fluent were used to determine the coefficients of lift and drag, as
well as the frequency of vortex shedding and size of vortices at three separate Reynolds numbers of 16000,
32000 and 65000 in different arrangements. Each arrangement of cylinders was compared against controls,
which consisted of a single cylinder to determine the alteration of forces produced. Two trip wires at 7
different angles of 40, 45, 50, 55, 60, 65, and 70 degrees were then investigated at a Reynolds number of
65000 which was compared to the smooth cylinder control forces and frequency of vortex shedding. The
most optimum angle of trip wires was then combined with linear cylinder arrangements also at a Reynolds
number of 65000 for comparison with only the upstream cylinder utilizing the trip wires.