The evolution of large-scale motions in turbulent pipe flow
The evolution of large-scale motions in turbulent pipe flow
A dual-plane snapshot POD analysis of turbulent pipe flow at a Reynolds number of 104,000 is presented. The high-speed PIV data were simultaneously acquired in two planes, a crossstream plane (2D-3C) and a streamwise plane (2D-2C) on the pipe centerline. The cross-stream plane analysis revealed large structures with a spatio-temporal extent of 1-2R, where R is the pipe radius. The temporal evolution of these large-scale structures is examined using the timeshifted correlation of the cross-stream snapshot POD coefficients, identifying the low energy intermediate modes responsible for the transition between the large-scale modes. By conditionallyaveraging based on the occurrence/intensity of a given cross-stream snapshot POD mode, a complex structure consisting of wall-attached and detached large-scale structures is shown to be associated with the most energetic modes. There is a pseudo-alignment of these large structures, that together create structures with a spatio-temporal extent of about 6R, which appears to explain the formation of the very large scale motions previously observed in pipe flow.
pipe flow, turbulence, proper orthogonal decomposition, very large scale motions
1-14
Hellstrom, Leo H.O.
900cd00d-b89a-45da-8bd7-b7cbc1d37475
Ganapathisubramani, Bharathram
5e69099f-2f39-4fdd-8a85-3ac906827052
Smits, Alexander J.
d453963c-aa30-4a31-b39c-8d199d0f8b29
Hellstrom, Leo H.O.
900cd00d-b89a-45da-8bd7-b7cbc1d37475
Ganapathisubramani, Bharathram
5e69099f-2f39-4fdd-8a85-3ac906827052
Smits, Alexander J.
d453963c-aa30-4a31-b39c-8d199d0f8b29
Hellstrom, Leo H.O., Ganapathisubramani, Bharathram and Smits, Alexander J.
(2015)
The evolution of large-scale motions in turbulent pipe flow.
Journal of Fluid Mechanics, .
(doi:10.1017/jfm.2015.418).
(In Press)
Abstract
A dual-plane snapshot POD analysis of turbulent pipe flow at a Reynolds number of 104,000 is presented. The high-speed PIV data were simultaneously acquired in two planes, a crossstream plane (2D-3C) and a streamwise plane (2D-2C) on the pipe centerline. The cross-stream plane analysis revealed large structures with a spatio-temporal extent of 1-2R, where R is the pipe radius. The temporal evolution of these large-scale structures is examined using the timeshifted correlation of the cross-stream snapshot POD coefficients, identifying the low energy intermediate modes responsible for the transition between the large-scale modes. By conditionallyaveraging based on the occurrence/intensity of a given cross-stream snapshot POD mode, a complex structure consisting of wall-attached and detached large-scale structures is shown to be associated with the most energetic modes. There is a pseudo-alignment of these large structures, that together create structures with a spatio-temporal extent of about 6R, which appears to explain the formation of the very large scale motions previously observed in pipe flow.
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Accepted/In Press date: 14 August 2015
Keywords:
pipe flow, turbulence, proper orthogonal decomposition, very large scale motions
Organisations:
Aeronautics, Astronautics & Comp. Eng
Identifiers
Local EPrints ID: 379540
URI: http://eprints.soton.ac.uk/id/eprint/379540
ISSN: 0022-1120
PURE UUID: 26383da5-d427-4474-86b9-77e9deaedc6f
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Date deposited: 14 Aug 2015 14:26
Last modified: 15 Mar 2024 03:37
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Contributors
Author:
Leo H.O. Hellstrom
Author:
Alexander J. Smits
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