Coherent structures in transitional pipe flow
Coherent structures in transitional pipe flow
Transition to turbulence in pipe flow is investigated experimentally using a temporally resolved dual-plane particle image velocimetry approach, at a Reynolds number of 3440. The flow is analyzed using proper orthogonal decomposition and it is shown that the flow can be divided into two regions: a pseudolaminar region governed by the presence of azimuthally steady traveling waves, and turbulent slugs. The evolution of the structures within the slugs is identified by using the temporally resolved data along with the dual-plane velocity field. These structures are shown to be remarkably similar to the large-scale motions found in fully turbulent flows, with a streamwise and spatiotemporal extent about four pipe radii. The transition between structures is characterized by the detachment and decay of an old structure and the initiation of a new structure at the wall
024403
Hellstrom, Leo H.O
b69e29a0-4f33-4e33-94f0-f0a4aed09c14
Ganapathisubramani, Bharath
5e69099f-2f39-4fdd-8a85-3ac906827052
Smits, Alexander J.
d453963c-aa30-4a31-b39c-8d199d0f8b29
14 June 2016
Hellstrom, Leo H.O
b69e29a0-4f33-4e33-94f0-f0a4aed09c14
Ganapathisubramani, Bharath
5e69099f-2f39-4fdd-8a85-3ac906827052
Smits, Alexander J.
d453963c-aa30-4a31-b39c-8d199d0f8b29
Hellstrom, Leo H.O, Ganapathisubramani, Bharath and Smits, Alexander J.
(2016)
Coherent structures in transitional pipe flow.
Physics of Fluids, 1, .
(doi:10.1103/PhysRevFluids.1.024403).
Abstract
Transition to turbulence in pipe flow is investigated experimentally using a temporally resolved dual-plane particle image velocimetry approach, at a Reynolds number of 3440. The flow is analyzed using proper orthogonal decomposition and it is shown that the flow can be divided into two regions: a pseudolaminar region governed by the presence of azimuthally steady traveling waves, and turbulent slugs. The evolution of the structures within the slugs is identified by using the temporally resolved data along with the dual-plane velocity field. These structures are shown to be remarkably similar to the large-scale motions found in fully turbulent flows, with a streamwise and spatiotemporal extent about four pipe radii. The transition between structures is characterized by the detachment and decay of an old structure and the initiation of a new structure at the wall
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FP10038
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Accepted/In Press date: 24 February 2016
e-pub ahead of print date: 14 June 2016
Published date: 14 June 2016
Organisations:
Aerodynamics & Flight Mechanics Group
Identifiers
Local EPrints ID: 401424
URI: http://eprints.soton.ac.uk/id/eprint/401424
ISSN: 1070-6631
PURE UUID: 55c1b76a-1f5f-4056-8dc0-43c4b0a03949
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Date deposited: 13 Oct 2016 12:51
Last modified: 15 Mar 2024 03:37
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Author:
Leo H.O Hellstrom
Author:
Alexander J. Smits
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