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Transition scenario of a sphere freely falling in a vertical tube

Published online by Cambridge University Press:  20 September 2012

Thibaut Deloze ,
Yannick Hoarau  and
Jan Dušek
Thibaut Deloze*
Affiliation:
Institut de Mécanique des Fluides et des Solides, Université de Strasbourg/CNRS, 67000 Strasbourg, France
Yannick Hoarau
Affiliation:
Institut de Mécanique des Fluides et des Solides, Université de Strasbourg/CNRS, 67000 Strasbourg, France
Jan Dušek
Affiliation:
Institut de Mécanique des Fluides et des Solides, Université de Strasbourg/CNRS, 67000 Strasbourg, France
*
†Email address for correspondence: [email protected]
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Abstract

The paper presents the results of direct numerical simulations of the fall of a single freely moving sphere in a vertical circular tube. Most results are obtained for the solid–fluid density ratio . The parametric investigation is carried out depending on the Galileo number defined in Jenny, Dušek & Bouchet J. Fluid Mech., vol. 508, 2004, pp. 201–239. A qualitatively new scenario is found, as compared to that of an unconfined sphere. The primary bifurcation making the sphere deviate from a vertical fall along the tube axis at a constant velocity is of Hopf type. It sets in at a Galileo number (between 155 and 160) similar to that for an unconfined sphere. We find evidence for two stages of the primary regime: a planar trajectory at and a helical one (at and 170). At these Galileo numbers, the regime is perfectly periodic, with a slow period corresponding to a Strouhal number only slightly above 0.01. The dynamics is identified as a periodic wake–wall interaction. The helical regime is found to give way directly to chaos between and . This transition is associated with the onset of vortex shedding in the wake of the falling sphere and with a complex interaction between the unsteady wake and the wall marked by intermittent wake extinction. The effect of density ratio is partly investigated at by considering three density ratios: 2, 3 and 5. A significant change of behaviour is found between the ratios 3 and 5.

JFM classification

Nonlinear Dynamical Systems: Nonlinear Dynamical Systems Instability: Transition to turbulence
Type
Papers
Information
Journal of Fluid Mechanics , Volume 711 , 25 November 2012 , pp. 40 - 60
Copyright
Copyright © Cambridge University Press 2012

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Thibaut Deloze, Yannick Hoarau and Jan Dušek

Wake structures obtained using the λ2 iso-surfaces suggested by Jeong & Hussain (1995) behind a sphere free falling in a tube (D/d=5, G=250 and ρs/ρ=2). The thick red line marks the trajectory of the sphere centre.

Download Thibaut Deloze, Yannick Hoarau and Jan Dušek(Video)
Video 6.1 MB

Thibaut Deloze, Yannick Hoarau and Jan Dušek

Wake structures obtained using the λ2 iso-surfaces suggested by Jeong & Hussain (1995) behind a sphere free falling in a tube (D/d=5, G=250 and ρs/ρ=2). The thick red line marks the trajectory of the sphere centre.

Download Thibaut Deloze, Yannick Hoarau and Jan Dušek(Video)
Video 6.8 MB