What is it about?
This work concerns the unsteady flow around a cylindrical body (plain tube) which is responsible for the integrated forces acting on the body. We did measurements of the unsteady velocity field in the wake of the cylinder using a technique Particle-Image Velocimetry.
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Why is it important?
Our study has revealed that the timing of of vortex shedding from a circular cylinder is directly linked to the frequency of vortex shedding. This finding has provided theoretical interpretation to counter-intuitive phenomena observed in vortex-induced streamwise vibrations of elastically-mounted cylinders, i.e. the fact that the response amplitude is minimal for conditions (reduced velocities) for which the forces acting on cylinder undergoing forced vibration are magnified.
Perspectives
This study has sparked interest on the fundamentals of vortex-induced vibration, which still appear to not be well understood.
Dr Efstathios Konstantinidis
Read the Original
This page is a summary of: The timing of vortex shedding in a cylinder wake imposed by periodic inflow perturbations, Journal of Fluid Mechanics, November 2005, Cambridge University Press,
DOI: 10.1017/s0022112005006786.
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