Characterization of Swirling Flows in a Partly Open Cylinder

Characterization of Swirling Flows in a Partly Open Cylinder

A partly open vertical disk-cylinder system, with an annular top lid, is used to model numerically the characteristics of axisymmetric swirling flows with stagnation and associated flows reversal; commonly referred to as vortex breakdown. The flows are driven by the bottom disk uniform rotation and...

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Bibliographic Details
Published in:Journal of Applied Fluid Mechanics Vol. 9; no. 6; pp. 3167 - 3176
Main Authors: Imoula, Malika, Saci, R, Benkoussas, B, Gatignol, Renee
Format: Journal Article
Language:English
Published: Isfahan Isfahan University of Technology 01-01-2016
Isfahan Isfahan University of Technology
Subjects:
Aspect ratio
Axisymmetric
Axisymmetric flow
Computational fluid dynamics
Cylinder; Lid radius-ratio; Stress-free surface; Vortex breakdown; Differential rotation
Cylinders
Differential rotation
Flow control
Fluid flow
Free surfaces
Mathematical models
Mechanics
Physics
Rotating disks
Stagnation
State (computer science)
Swirling
Vortex breakdown
Lid radius-ratio
Cylinder
Differential rotation
Vortex breakdown
Stress-free surface
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Summary:A partly open vertical disk-cylinder system, with an annular top lid, is used to model numerically the characteristics of axisymmetric swirling flows with stagnation and associated flows reversal; commonly referred to as vortex breakdown. The flows are driven by the bottom disk uniform rotation and controlled by the competition between the no-slip and stress-free surface conditions applied at the top. Depending on the radial extent of the free surface, distinct regions of toroidal, corner and on-axis vortex type flows were identified and mapped into a state diagram then discussed. In addition, the impact of the cavity aspect ratio on the onset conditions of stagnation and breakdown was highlighted. Moreover, the study explored the influence of a diffusion driven meridian circulation, induced by the sidewall differential rotation, which is revealed to constitute an effective non intrusive kinematic means of flow control.
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ISSN:1735-3572
1735-3645
DOI:10.29252/jafm.09.06.26281