Self-similarity of passive scalars in a decelerating jet
Self-similarity of passive scalars in a decelerating jet
Scalar mixing is investigated in a decelerating turbulent round jet using direct numerical simulation. The mass fraction of jet fluid and the fluid residence time, measured by the mass-weighted age of the jet fluid, both exhibit self-similar radial profiles in statistically-stationary turbulent jets. Upon stopping the inflow, a deceleration wave passes through the jet, behind which a new self-similar state is observed for the two scalar variables. The self-similar state during the jet deceleration is different from that in the statistically-stationary jet. Opposite to its behaviour in the steady-state jet, the jet fluid mass fraction exhibits a linear increase with downstream distance in the decelerating jet, whereas the centreline mass-weighted age of jet fluid remains proportional to downstream distance. The dynamics of the scalar mixing in the transient self-similar state are discussed through analysis of the scalar transport budgets.
International Symposium series on Turbulence and Shear Flow Phenomena
Shin, D
214c77cf-b4fa-4576-9941-a4bf79ce3c41
Aspden, Andrew
7353e0e9-fbed-4f5a-a610-b045cd4cd576
Richardson, Edward
a8357516-e871-40d8-8a53-de7847aa2d08
6 July 2017
Shin, D
214c77cf-b4fa-4576-9941-a4bf79ce3c41
Aspden, Andrew
7353e0e9-fbed-4f5a-a610-b045cd4cd576
Richardson, Edward
a8357516-e871-40d8-8a53-de7847aa2d08
Shin, D, Aspden, Andrew and Richardson, Edward
(2017)
Self-similarity of passive scalars in a decelerating jet.
In Proceedings of TSFP-10 (2017) Chicago.
vol. 2,
International Symposium series on Turbulence and Shear Flow Phenomena..
Record type:
Conference or Workshop Item
(Paper)
Abstract
Scalar mixing is investigated in a decelerating turbulent round jet using direct numerical simulation. The mass fraction of jet fluid and the fluid residence time, measured by the mass-weighted age of the jet fluid, both exhibit self-similar radial profiles in statistically-stationary turbulent jets. Upon stopping the inflow, a deceleration wave passes through the jet, behind which a new self-similar state is observed for the two scalar variables. The self-similar state during the jet deceleration is different from that in the statistically-stationary jet. Opposite to its behaviour in the steady-state jet, the jet fluid mass fraction exhibits a linear increase with downstream distance in the decelerating jet, whereas the centreline mass-weighted age of jet fluid remains proportional to downstream distance. The dynamics of the scalar mixing in the transient self-similar state are discussed through analysis of the scalar transport budgets.
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Shin_JetScalars_TSFP10_2017
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Accepted/In Press date: 26 November 2016
e-pub ahead of print date: 6 July 2017
Published date: 6 July 2017
Venue - Dates:
Tenth International Symposium on Turbulence and Shear Flow Phenomena, Swissotel, Chicago, United States, 2017-07-06 - 2017-07-09
Organisations:
Mathematical Sciences, Aerodynamics & Flight Mechanics Group
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Local EPrints ID: 410550
URI: http://eprints.soton.ac.uk/id/eprint/410550
PURE UUID: 9f79abe1-89c3-4a68-8776-376503767a9e
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Date deposited: 09 Jun 2017 09:04
Last modified: 11 May 2024 01:44
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Author:
D Shin
Author:
Andrew Aspden
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