Lift-up process in a heated-cylinder wake flow

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Abstract

A three-dimensional flow transition behind a heated cylinder is analyzed at low Reynolds numbers: Re=O(100). Both visualizations and numerical simulations show that the transition manifests itself in the form of mushroom-type structures in the far wake and Lambda-shaped structures in the near wake. The legs of the Lambda-shaped structures coincide with streamwise vorticity regions. An intermediate stage is observed between the Lambda-shaped structures and the escaping mushroom-type structures. This intermediate step is characterized by a lift-up process, which takes place in the center region between the legs and head of the Lambda-shaped structures. As a result, hot fluid is being pulled out of the upper vortex core. Due to this lift-up process, mushroom-type structures are generated in the form of escaping vortex rings in the far wake.
Original languageEnglish
Pages (from-to)014106-1/12
JournalPhysics of Fluids
Volume18
Issue number1
DOIs
Publication statusPublished - 2006

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wakes
near wakes
vortex rings
three dimensional flow
low Reynolds number
vorticity
vortices
fluids
simulation

Cite this

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title = "Lift-up process in a heated-cylinder wake flow",
abstract = "A three-dimensional flow transition behind a heated cylinder is analyzed at low Reynolds numbers: Re=O(100). Both visualizations and numerical simulations show that the transition manifests itself in the form of mushroom-type structures in the far wake and Lambda-shaped structures in the near wake. The legs of the Lambda-shaped structures coincide with streamwise vorticity regions. An intermediate stage is observed between the Lambda-shaped structures and the escaping mushroom-type structures. This intermediate step is characterized by a lift-up process, which takes place in the center region between the legs and head of the Lambda-shaped structures. As a result, hot fluid is being pulled out of the upper vortex core. Due to this lift-up process, mushroom-type structures are generated in the form of escaping vortex rings in the far wake.",
author = "M. Ren and C.C.M. Rindt and {Steenhoven, van}, A.A.",
year = "2006",
doi = "10.1063/1.2159031",
language = "English",
volume = "18",
pages = "014106--1/12",
journal = "Physics of Fluids",
issn = "1070-6631",
publisher = "American Institute of Physics",
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}

Lift-up process in a heated-cylinder wake flow. / Ren, M.; Rindt, C.C.M.; Steenhoven, van, A.A.

In: Physics of Fluids, Vol. 18, No. 1, 2006, p. 014106-1/12.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Lift-up process in a heated-cylinder wake flow

AU - Ren, M.

AU - Rindt, C.C.M.

AU - Steenhoven, van, A.A.

PY - 2006

Y1 - 2006

N2 - A three-dimensional flow transition behind a heated cylinder is analyzed at low Reynolds numbers: Re=O(100). Both visualizations and numerical simulations show that the transition manifests itself in the form of mushroom-type structures in the far wake and Lambda-shaped structures in the near wake. The legs of the Lambda-shaped structures coincide with streamwise vorticity regions. An intermediate stage is observed between the Lambda-shaped structures and the escaping mushroom-type structures. This intermediate step is characterized by a lift-up process, which takes place in the center region between the legs and head of the Lambda-shaped structures. As a result, hot fluid is being pulled out of the upper vortex core. Due to this lift-up process, mushroom-type structures are generated in the form of escaping vortex rings in the far wake.

AB - A three-dimensional flow transition behind a heated cylinder is analyzed at low Reynolds numbers: Re=O(100). Both visualizations and numerical simulations show that the transition manifests itself in the form of mushroom-type structures in the far wake and Lambda-shaped structures in the near wake. The legs of the Lambda-shaped structures coincide with streamwise vorticity regions. An intermediate stage is observed between the Lambda-shaped structures and the escaping mushroom-type structures. This intermediate step is characterized by a lift-up process, which takes place in the center region between the legs and head of the Lambda-shaped structures. As a result, hot fluid is being pulled out of the upper vortex core. Due to this lift-up process, mushroom-type structures are generated in the form of escaping vortex rings in the far wake.

U2 - 10.1063/1.2159031

DO - 10.1063/1.2159031

M3 - Article

VL - 18

SP - 014106-1/12

JO - Physics of Fluids

JF - Physics of Fluids

SN - 1070-6631

IS - 1

ER -