Topical Problems of Fluid Mechanics


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Institute of Thermomechanics AS CR, v.v.i. CTU in Prague Faculty of Mech. Engineering Dept. Tech. Mathematics MIO Université du Sud Toulon Var - AMU - CNRS - IRD Czech Pilot centre ERCOFTAC
Effect of a Pulsating Radial Motion of the Outer Cylinder on the Onset of Taylor Vortices in Finite - Length Geometry

Lalaoua A.

Abstract:
The fluid flowing in the annular gap between two rotating cylinders; called Taylor-Couette flow, has been used as paradigm for the hydrodynamic stability theory and the transition to turbulence. In this paper, the fluid in an annulus between short concentric cylinders is investigated using CFD simulation for a three dimensional viscous and incompressible flow. The inner cylinder rotates freely about a vertical axis through its centre while the outer cylinder is held stationary and oscillating radially. The main purpose is to examine the effect of a pulsatile motion of the outer cylinder on the onset of Taylor vortices in the vicinity of the threshold of transition, i.e., from the laminar Couette flow to the occurrence of Taylor vortex flow. The numerical results obtained here show significant topological changes on the Taylor vortices. In addition, the active control deeply affects the occurrence of the first instability. It is established that the appearance of the Taylor vortex flow is then substantially delayed with respect to the classical case (without control).

Keywords:
CFD simulation, pulsating motion, Finite geometry, active control, Taylor-Couette flow
Fulltext: PDF
DOI: No Doi
In Proceedings Topical Problems of Fluid Mechanics 2015, Prague, 2015 Edited by David Šimurda and Tomáš Bodnár, pp. 105-116
ISBN 978-80-87012-55-0 (Print)
ISSN 2336-5781 (Print)
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