Vortex scenario and bubble generation in a cylindrical cavity with rotating top and bottom

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The creation of recirculation bubbles in a steady, viscous flow in a cylindrical cavity with co-rotating top and bottom is investigated numerically. By varying the Reynolds number and the aspect ratio of the cylinder various axial-symmetric flow regimes are studied. It is observed that the topology of re-circulating vortex is associated with a change in helical symmetry of the vortex lines. The computations show that symmetry changes take place at increasing Reynolds numbers and that flow reversal on the center axis is associated with a growth of the twist parameter of the vortex lines. For all studied flow cases, independent of aspect ratio and Reynolds number, it was observed that the twist parameter of the central vortex attains a threshold value of K=0.6 at the point where flow reversal takes place.
Original languageEnglish
JournalEuropean Journal of Mechanics B/Fluids
Volume24
Pages (from-to)137-148
ISSN0997-7546
Publication statusPublished - 2005

Cite this

@article{a21763104a734697b23f04c60faadb48,
title = "Vortex scenario and bubble generation in a cylindrical cavity with rotating top and bottom",
abstract = "The creation of recirculation bubbles in a steady, viscous flow in a cylindrical cavity with co-rotating top and bottom is investigated numerically. By varying the Reynolds number and the aspect ratio of the cylinder various axial-symmetric flow regimes are studied. It is observed that the topology of re-circulating vortex is associated with a change in helical symmetry of the vortex lines. The computations show that symmetry changes take place at increasing Reynolds numbers and that flow reversal on the center axis is associated with a growth of the twist parameter of the vortex lines. For all studied flow cases, independent of aspect ratio and Reynolds number, it was observed that the twist parameter of the central vortex attains a threshold value of K=0.6 at the point where flow reversal takes place.",
author = "Okulov, {Valery L.} and S{\o}rensen, {Jens N{\o}rk{\ae}r} and Voigt, {Lars K.}",
year = "2005",
language = "English",
volume = "24",
pages = "137--148",
journal = "European Journal of Mechanics B - Fluids",
issn = "0997-7546",
publisher = "Elsevier",

}

Vortex scenario and bubble generation in a cylindrical cavity with rotating top and bottom. / Okulov, Valery L.; Sørensen, Jens Nørkær; Voigt, Lars K.

In: European Journal of Mechanics B/Fluids, Vol. 24, 2005, p. 137-148.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Vortex scenario and bubble generation in a cylindrical cavity with rotating top and bottom

AU - Okulov, Valery L.

AU - Sørensen, Jens Nørkær

AU - Voigt, Lars K.

PY - 2005

Y1 - 2005

N2 - The creation of recirculation bubbles in a steady, viscous flow in a cylindrical cavity with co-rotating top and bottom is investigated numerically. By varying the Reynolds number and the aspect ratio of the cylinder various axial-symmetric flow regimes are studied. It is observed that the topology of re-circulating vortex is associated with a change in helical symmetry of the vortex lines. The computations show that symmetry changes take place at increasing Reynolds numbers and that flow reversal on the center axis is associated with a growth of the twist parameter of the vortex lines. For all studied flow cases, independent of aspect ratio and Reynolds number, it was observed that the twist parameter of the central vortex attains a threshold value of K=0.6 at the point where flow reversal takes place.

AB - The creation of recirculation bubbles in a steady, viscous flow in a cylindrical cavity with co-rotating top and bottom is investigated numerically. By varying the Reynolds number and the aspect ratio of the cylinder various axial-symmetric flow regimes are studied. It is observed that the topology of re-circulating vortex is associated with a change in helical symmetry of the vortex lines. The computations show that symmetry changes take place at increasing Reynolds numbers and that flow reversal on the center axis is associated with a growth of the twist parameter of the vortex lines. For all studied flow cases, independent of aspect ratio and Reynolds number, it was observed that the twist parameter of the central vortex attains a threshold value of K=0.6 at the point where flow reversal takes place.

M3 - Journal article

VL - 24

SP - 137

EP - 148

JO - European Journal of Mechanics B - Fluids

JF - European Journal of Mechanics B - Fluids

SN - 0997-7546

ER -