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Laboratory experiments on the temporal decay of homogeneous anisotropic turbulence

Laboratory experiments on the temporal decay of homogeneous anisotropic turbulence
Laboratory experiments on the temporal decay of homogeneous anisotropic turbulence
We experimentally investigate the temporal decay of homogeneous anisotropic turbulence, monitoring the evolution of velocity fluctuations, dissipation and turbulent length scales over time. We employ an apparatus in which two facing random jet arrays of water pumps generate turbulence with negligible mean flow and shear over a volume that is much larger than the initial characteristic turbulent large scale of the flow. The Reynolds number based on the Taylor microscale for forced turbulence is Reλ ≈ 580 and the axial-to-radial ratio of the root mean square velocity fluctuations is 1.22. Two velocity components are measured by particle image velocimetry at the symmetry plane of the water tank. Measurements are taken for both ‘stationary’ forced turbulence and natural decaying turbulence. For decaying turbulence, power-law fits to the decay of turbulent kinetic energy reveal two regions over time; in the near-field region (t/tL < 10, tL is the integral time scale of the forced turbulence) a decay exponent m ≈ −2.3 is found whereas for the far-field region (t/tL > 10) the value of the decay exponent was found to be affected by turbulence saturation. The near-field exhibits features of non-equilibrium turbulence with constant L/λ and varying C (dissipation constant). We found a decay exponent m ≈ −1.4 for the unsaturated regime and m ≈ −1.8 for the saturated regime, in good agreement with previous numerical and experimental studies. We also observe a fast evolution towards isotropy at small scales, whereas anisotropy at large scales remains in the flow over more than 100 tL. Direct estimates of dissipation are obtained and the decay exponent agrees well with the prediction m = m−1 throughout the decay process.
0022-1120
Blay Esteban, Luis
cbfef12f-f6c3-460f-b614-c347c0291351
Shrimpton, John
9cf82d2e-2f00-4ddf-bd19-9aff443784af
Ganapathisubramani, Bharathram
5e69099f-2f39-4fdd-8a85-3ac906827052
Blay Esteban, Luis
cbfef12f-f6c3-460f-b614-c347c0291351
Shrimpton, John
9cf82d2e-2f00-4ddf-bd19-9aff443784af
Ganapathisubramani, Bharathram
5e69099f-2f39-4fdd-8a85-3ac906827052

Blay Esteban, Luis, Shrimpton, John and Ganapathisubramani, Bharathram (2019) Laboratory experiments on the temporal decay of homogeneous anisotropic turbulence. Journal of Fluid Mechanics, 862. (doi:10.1017/jfm.2018.964).

Record type: Article

Abstract

We experimentally investigate the temporal decay of homogeneous anisotropic turbulence, monitoring the evolution of velocity fluctuations, dissipation and turbulent length scales over time. We employ an apparatus in which two facing random jet arrays of water pumps generate turbulence with negligible mean flow and shear over a volume that is much larger than the initial characteristic turbulent large scale of the flow. The Reynolds number based on the Taylor microscale for forced turbulence is Reλ ≈ 580 and the axial-to-radial ratio of the root mean square velocity fluctuations is 1.22. Two velocity components are measured by particle image velocimetry at the symmetry plane of the water tank. Measurements are taken for both ‘stationary’ forced turbulence and natural decaying turbulence. For decaying turbulence, power-law fits to the decay of turbulent kinetic energy reveal two regions over time; in the near-field region (t/tL < 10, tL is the integral time scale of the forced turbulence) a decay exponent m ≈ −2.3 is found whereas for the far-field region (t/tL > 10) the value of the decay exponent was found to be affected by turbulence saturation. The near-field exhibits features of non-equilibrium turbulence with constant L/λ and varying C (dissipation constant). We found a decay exponent m ≈ −1.4 for the unsaturated regime and m ≈ −1.8 for the saturated regime, in good agreement with previous numerical and experimental studies. We also observe a fast evolution towards isotropy at small scales, whereas anisotropy at large scales remains in the flow over more than 100 tL. Direct estimates of dissipation are obtained and the decay exponent agrees well with the prediction m = m−1 throughout the decay process.

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Laboratory experiments on the decay of homogeneous anisotropic turbulence - Accepted Manuscript
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More information

Accepted/In Press date: 18 November 2018
e-pub ahead of print date: 7 January 2019
Published date: 10 March 2019

Identifiers

Local EPrints ID: 426685
URI: https://eprints.soton.ac.uk/id/eprint/426685
ISSN: 0022-1120
PURE UUID: f965bfc4-6b80-42a9-be74-b0e02280222d
ORCID for Bharathram Ganapathisubramani: ORCID iD orcid.org/0000-0001-9817-0486

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Date deposited: 10 Dec 2018 17:31
Last modified: 20 Jul 2019 04:04

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