The interaction between strain-rate and rotation in shear flow turbulence from inertial range to dissipative length scales
The interaction between strain-rate and rotation in shear flow turbulence from inertial range to dissipative length scales
Direct numerical simulation data from the self similar region of a planar mixing layer is filtered at four different length scales, from the Taylor microscale to the dissipative scales, and is used to examine the scale dependence of the strain-rotation interaction in shear flow turbulence. The interaction is examined by exploring the alignment between the extensive strain-rate eigenvector and the vorticity vector. Results show that the mechanism for enstrophy amplification (propensity of which increases when the two vectors are parallel) is scale dependent with the probability of the two vectors being parallel higher for larger length scales. However, the mechanism for enstrophy attenuation, i.e., the probability of the two vectors being perpendicular to each other, appears to be scale independent.
eigenvalues and eigenfunctions, flow simulation, fractals, mixing, shear turbulence, vortices
061704-[4pp]
Buxton, O.R.H.
02f9e46b-0466-4294-9640-62dc7c1a1766
Laizet, S.
74f95ec1-e915-427c-a1a3-d13e8729d0fb
Ganapathisubramani, B.
5e69099f-2f39-4fdd-8a85-3ac906827052
June 2011
Buxton, O.R.H.
02f9e46b-0466-4294-9640-62dc7c1a1766
Laizet, S.
74f95ec1-e915-427c-a1a3-d13e8729d0fb
Ganapathisubramani, B.
5e69099f-2f39-4fdd-8a85-3ac906827052
Buxton, O.R.H., Laizet, S. and Ganapathisubramani, B.
(2011)
The interaction between strain-rate and rotation in shear flow turbulence from inertial range to dissipative length scales.
Physics of Fluids, 23 (6), .
(doi:10.1063/1.3599080).
Abstract
Direct numerical simulation data from the self similar region of a planar mixing layer is filtered at four different length scales, from the Taylor microscale to the dissipative scales, and is used to examine the scale dependence of the strain-rotation interaction in shear flow turbulence. The interaction is examined by exploring the alignment between the extensive strain-rate eigenvector and the vorticity vector. Results show that the mechanism for enstrophy amplification (propensity of which increases when the two vectors are parallel) is scale dependent with the probability of the two vectors being parallel higher for larger length scales. However, the mechanism for enstrophy attenuation, i.e., the probability of the two vectors being perpendicular to each other, appears to be scale independent.
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Published date: June 2011
Keywords:
eigenvalues and eigenfunctions, flow simulation, fractals, mixing, shear turbulence, vortices
Organisations:
Aerodynamics & Flight Mechanics Group
Identifiers
Local EPrints ID: 355000
URI: http://eprints.soton.ac.uk/id/eprint/355000
ISSN: 1070-6631
PURE UUID: d50a4620-7ced-462d-985f-b987a99d785a
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Date deposited: 12 Aug 2013 11:23
Last modified: 15 Mar 2024 03:37
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Author:
O.R.H. Buxton
Author:
S. Laizet
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