Bluff-body Flow Created By Combined Rotary
And Translational Oscillation
Author(s)
S. Kocabiyik & Q. M. Al-Mdallal
Abstract
The wake states and loading due to combined forced transverse and rotational
oscillations of a circular cylinder are studied. The governing equations based on
stream function-vorticity formulation are solved numerically using an accurate
spectral finite-difference method. Results are presented for three sets of the four
dimensionless groups which characterize these flows for combined phase-locked
translation and rotation with a single frequency. The lock-on phenomenon has been
predicted and its effect on the flow hydrodynamics has been determined.
Keywords: computation, unsteady, incompressible, viscous, translational and rotational
oscillations, cylinder.
1 Introduction
When the body periodically oscillated by external forcing, the vortex shedding
frequency may be modified or shifted from its natural shedding frequency to the
forcing frequency. This \“lock-on” of vortex shedding to the forcing frequency
causes a number of significant changes to occur in both the wake structure and
the dynamic of fluid forces and provides potential means for active control of the
wake flow behind a bluff body.
The phenomenon of vortex induced vibration of bluff bodies has been studied
extensively. Despite the large number of papers dedicated to the problem of a
cylinder vibrating transverse to a fluid flow (see S¨umer and Fredsøe [1]) there is
only one paper which also allow the body to perform rotational oscillations in
a quiescent fluid: Blackburn et al. [2]. A literature survey reveals there are no
papers studying the case of vortex-induced vibrations in which a circular cylinder
moves with combined transverse and rotational oscillations in a uniform flow.
Keywords
computation, unsteady, incompressible, viscous, translational and rotational
oscillations, cylinder.
Related Book
Other papers in this volume
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