Evolution of an initially columnar vortex terminating normal to a no-slip wall

A. Hirsa, Juan Lopez, S. Kim

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

The early evolution of an initially columnar vortex normal to a solid wall was examined. The vortex was generated by a pair of flaps in a water tank. Detrimental effects from the wall during the vortex generation were avoided by producing the vortex normal to a free surface and subsequently bringing a horizontal plate into contact with the surface. Digital particle image velocimetry (DPIV) measurements of the velocity and vorticity, together with laser induced fluorescence (LIF) visualizations, in a meridional plane revealed a toroidal structure with the appearance of an axisymmetric vortex breakdown bubble. Agreement was found between the measurements and numerical simulations of the axisymmetric Navier-Stokes equations. The results show that the flow in the effusive corner region is dominated by a Bödewadt-type spatially oscillatory boundary layer within the core region and a potential-like vortex boundary layer at large radii. The toroidal structure results from the interaction between these two boundary layers, leading to the roll up of a dominant shear layer within the Bödewadt structure, and does not develop from the columnar vortex itself.

Original languageEnglish (US)
Pages (from-to)309-321
Number of pages13
JournalExperiments in Fluids
Volume29
Issue number4
StatePublished - Oct 2000

Fingerprint

stopping
Vortex flow
slip
vortices
boundary layers
Boundary layers
vortex breakdown
vortex generators
shear layers
particle image velocimetry
laser induced fluorescence
Navier-Stokes equation
vorticity
Flaps
Water tanks
bubbles
Vorticity
Velocity measurement
Navier Stokes equations
radii

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes
  • Computational Mechanics
  • Mechanical Engineering
  • Mechanics of Materials

Cite this

Evolution of an initially columnar vortex terminating normal to a no-slip wall. / Hirsa, A.; Lopez, Juan; Kim, S.

In: Experiments in Fluids, Vol. 29, No. 4, 10.2000, p. 309-321.

Research output: Contribution to journalArticle

@article{ace8b8983388443ca0d272377ef9ddde,
title = "Evolution of an initially columnar vortex terminating normal to a no-slip wall",
abstract = "The early evolution of an initially columnar vortex normal to a solid wall was examined. The vortex was generated by a pair of flaps in a water tank. Detrimental effects from the wall during the vortex generation were avoided by producing the vortex normal to a free surface and subsequently bringing a horizontal plate into contact with the surface. Digital particle image velocimetry (DPIV) measurements of the velocity and vorticity, together with laser induced fluorescence (LIF) visualizations, in a meridional plane revealed a toroidal structure with the appearance of an axisymmetric vortex breakdown bubble. Agreement was found between the measurements and numerical simulations of the axisymmetric Navier-Stokes equations. The results show that the flow in the effusive corner region is dominated by a B{\"o}dewadt-type spatially oscillatory boundary layer within the core region and a potential-like vortex boundary layer at large radii. The toroidal structure results from the interaction between these two boundary layers, leading to the roll up of a dominant shear layer within the B{\"o}dewadt structure, and does not develop from the columnar vortex itself.",
author = "A. Hirsa and Juan Lopez and S. Kim",
year = "2000",
month = "10",
language = "English (US)",
volume = "29",
pages = "309--321",
journal = "Experiments in Fluids",
issn = "0723-4864",
publisher = "Springer Verlag",
number = "4",

}

TY - JOUR

T1 - Evolution of an initially columnar vortex terminating normal to a no-slip wall

AU - Hirsa, A.

AU - Lopez, Juan

AU - Kim, S.

PY - 2000/10

Y1 - 2000/10

N2 - The early evolution of an initially columnar vortex normal to a solid wall was examined. The vortex was generated by a pair of flaps in a water tank. Detrimental effects from the wall during the vortex generation were avoided by producing the vortex normal to a free surface and subsequently bringing a horizontal plate into contact with the surface. Digital particle image velocimetry (DPIV) measurements of the velocity and vorticity, together with laser induced fluorescence (LIF) visualizations, in a meridional plane revealed a toroidal structure with the appearance of an axisymmetric vortex breakdown bubble. Agreement was found between the measurements and numerical simulations of the axisymmetric Navier-Stokes equations. The results show that the flow in the effusive corner region is dominated by a Bödewadt-type spatially oscillatory boundary layer within the core region and a potential-like vortex boundary layer at large radii. The toroidal structure results from the interaction between these two boundary layers, leading to the roll up of a dominant shear layer within the Bödewadt structure, and does not develop from the columnar vortex itself.

AB - The early evolution of an initially columnar vortex normal to a solid wall was examined. The vortex was generated by a pair of flaps in a water tank. Detrimental effects from the wall during the vortex generation were avoided by producing the vortex normal to a free surface and subsequently bringing a horizontal plate into contact with the surface. Digital particle image velocimetry (DPIV) measurements of the velocity and vorticity, together with laser induced fluorescence (LIF) visualizations, in a meridional plane revealed a toroidal structure with the appearance of an axisymmetric vortex breakdown bubble. Agreement was found between the measurements and numerical simulations of the axisymmetric Navier-Stokes equations. The results show that the flow in the effusive corner region is dominated by a Bödewadt-type spatially oscillatory boundary layer within the core region and a potential-like vortex boundary layer at large radii. The toroidal structure results from the interaction between these two boundary layers, leading to the roll up of a dominant shear layer within the Bödewadt structure, and does not develop from the columnar vortex itself.

UR - http://www.scopus.com/inward/record.url?scp=0004198214&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0004198214&partnerID=8YFLogxK

M3 - Article

VL - 29

SP - 309

EP - 321

JO - Experiments in Fluids

JF - Experiments in Fluids

SN - 0723-4864

IS - 4

ER -