Control of vortex breakdown in a closed cylinder with a rotating lid

Bo Hoffmann Jørgensen, Jens Nørkær Sørensen, Nadine Aubry

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The flow within a closed cylinder with a rotating lid is considered as a prototype for fundamental studies of vortex breakdown. Numerical simulations for various parameter values have been carried out to reproduce the known effect of a thin rotating rod positioned along the center axis as well as analyze the influence of local vorticity sources. As expected, the results show that the breakdown bubbles in the steady axisymmetric flow can be affected dramatically, i.e., fully suppressed or significantly enhanced, by rotating the rod. The main contribution of this article is to show that the observed behavior can be explained by the vorticity generated by the rod locally near the rotating lid and near the fixed lid, as analogous behavior is caused by the introduction of local vorticity sources in the flow without a rod. Moreover, we describe the influence on the breakdown bubbles of the vorticity sources by an analytical model. In addition to improving our understanding, this finding should also open the door to other types of flow control devices capable of generating localized vorticity.
Original languageEnglish
JournalTheoretical and Computational Fluid Dynamics
Volume24
Issue number5
Pages (from-to)483-496
ISSN0935-4964
DOIs
Publication statusPublished - 2010

Keywords

  • Vortex breakdown suppression
  • Flow control
  • Rotating flow
  • Laminar flows in cavities

Cite this

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title = "Control of vortex breakdown in a closed cylinder with a rotating lid",
abstract = "The flow within a closed cylinder with a rotating lid is considered as a prototype for fundamental studies of vortex breakdown. Numerical simulations for various parameter values have been carried out to reproduce the known effect of a thin rotating rod positioned along the center axis as well as analyze the influence of local vorticity sources. As expected, the results show that the breakdown bubbles in the steady axisymmetric flow can be affected dramatically, i.e., fully suppressed or significantly enhanced, by rotating the rod. The main contribution of this article is to show that the observed behavior can be explained by the vorticity generated by the rod locally near the rotating lid and near the fixed lid, as analogous behavior is caused by the introduction of local vorticity sources in the flow without a rod. Moreover, we describe the influence on the breakdown bubbles of the vorticity sources by an analytical model. In addition to improving our understanding, this finding should also open the door to other types of flow control devices capable of generating localized vorticity.",
keywords = "Vortex breakdown suppression, Flow control, Rotating flow, Laminar flows in cavities",
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Control of vortex breakdown in a closed cylinder with a rotating lid. / Jørgensen, Bo Hoffmann; Sørensen, Jens Nørkær; Aubry, Nadine.

In: Theoretical and Computational Fluid Dynamics, Vol. 24, No. 5, 2010, p. 483-496.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Control of vortex breakdown in a closed cylinder with a rotating lid

AU - Jørgensen, Bo Hoffmann

AU - Sørensen, Jens Nørkær

AU - Aubry, Nadine

PY - 2010

Y1 - 2010

N2 - The flow within a closed cylinder with a rotating lid is considered as a prototype for fundamental studies of vortex breakdown. Numerical simulations for various parameter values have been carried out to reproduce the known effect of a thin rotating rod positioned along the center axis as well as analyze the influence of local vorticity sources. As expected, the results show that the breakdown bubbles in the steady axisymmetric flow can be affected dramatically, i.e., fully suppressed or significantly enhanced, by rotating the rod. The main contribution of this article is to show that the observed behavior can be explained by the vorticity generated by the rod locally near the rotating lid and near the fixed lid, as analogous behavior is caused by the introduction of local vorticity sources in the flow without a rod. Moreover, we describe the influence on the breakdown bubbles of the vorticity sources by an analytical model. In addition to improving our understanding, this finding should also open the door to other types of flow control devices capable of generating localized vorticity.

AB - The flow within a closed cylinder with a rotating lid is considered as a prototype for fundamental studies of vortex breakdown. Numerical simulations for various parameter values have been carried out to reproduce the known effect of a thin rotating rod positioned along the center axis as well as analyze the influence of local vorticity sources. As expected, the results show that the breakdown bubbles in the steady axisymmetric flow can be affected dramatically, i.e., fully suppressed or significantly enhanced, by rotating the rod. The main contribution of this article is to show that the observed behavior can be explained by the vorticity generated by the rod locally near the rotating lid and near the fixed lid, as analogous behavior is caused by the introduction of local vorticity sources in the flow without a rod. Moreover, we describe the influence on the breakdown bubbles of the vorticity sources by an analytical model. In addition to improving our understanding, this finding should also open the door to other types of flow control devices capable of generating localized vorticity.

KW - Vortex breakdown suppression

KW - Flow control

KW - Rotating flow

KW - Laminar flows in cavities

U2 - 10.1007/s00162-010-0180-z

DO - 10.1007/s00162-010-0180-z

M3 - Journal article

VL - 24

SP - 483

EP - 496

JO - Theoretical and Computational Fluid Dynamics

JF - Theoretical and Computational Fluid Dynamics

SN - 0935-4964

IS - 5

ER -