Velocity derivative skewness in fractal-generated, non-equilibrium grid turbulence
Velocity derivative skewness in fractal-generated, non-equilibrium grid turbulence
The evolution of the velocity derivative skewness, S(?u/?x), is investigated along two streamwise axes and four transverse positions in the wake of a square-fractal-element grid. In the near-field, the produced turbulence exhibits non-equilibrium characteristics including C ? ?Re ? M /Re ? L . In the far-field, the turbulence agrees with canonical grid turbulence results and C ? is approximately constant. It is found that in the non-equilibrium region, the value of ?S(?u/?x) is dependent on both streamwise and transverse positions, but after a sufficient decay period, it takes on a near constant value in the far-field. It is demonstrated that the evolution C ? approximately corresponds to that of ?S(?u/?x), which is suggestive that some of the non-equilibrium properties are likely a result of residual strain from the turbulence generating conditions.
071701-[6pp]
Hearst, Robert Jason
965708e6-ddf4-4cbb-af74-866bb4cdb4de
Lavoie, Philippe
04aaae82-b9ba-420a-a1c0-3df4f08b3306
6 July 2015
Hearst, Robert Jason
965708e6-ddf4-4cbb-af74-866bb4cdb4de
Lavoie, Philippe
04aaae82-b9ba-420a-a1c0-3df4f08b3306
Hearst, Robert Jason and Lavoie, Philippe
(2015)
Velocity derivative skewness in fractal-generated, non-equilibrium grid turbulence.
Physics of Fluids, 27, .
(doi:10.1063/1.4926356).
Abstract
The evolution of the velocity derivative skewness, S(?u/?x), is investigated along two streamwise axes and four transverse positions in the wake of a square-fractal-element grid. In the near-field, the produced turbulence exhibits non-equilibrium characteristics including C ? ?Re ? M /Re ? L . In the far-field, the turbulence agrees with canonical grid turbulence results and C ? is approximately constant. It is found that in the non-equilibrium region, the value of ?S(?u/?x) is dependent on both streamwise and transverse positions, but after a sufficient decay period, it takes on a near constant value in the far-field. It is demonstrated that the evolution C ? approximately corresponds to that of ?S(?u/?x), which is suggestive that some of the non-equilibrium properties are likely a result of residual strain from the turbulence generating conditions.
Text
fractal5_skew_pof_rev2_bw.pdf
- Accepted Manuscript
More information
Submitted date: 15 February 2015
Accepted/In Press date: 5 June 2015
Published date: 6 July 2015
Organisations:
Aerodynamics & Flight Mechanics Group
Identifiers
Local EPrints ID: 380979
URI: http://eprints.soton.ac.uk/id/eprint/380979
ISSN: 1070-6631
PURE UUID: 7fccffe3-0334-4cbe-99bd-5b77d42a51c8
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Date deposited: 22 Sep 2015 08:47
Last modified: 14 Mar 2024 21:08
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Author:
Robert Jason Hearst
Author:
Philippe Lavoie
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