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Unsteady self-similarity of jet fluid age and mass fraction

Unsteady self-similarity of jet fluid age and mass fraction
Unsteady self-similarity of jet fluid age and mass fraction
Scalar mixing is investigated in a decelerating turbulent round jet using direct numerical simulation. The main focus is to determine and model any new self-similar states in the unsteady flow as well as predict the centerline evolution of relevant flow quantities. The mass fraction of jet fluid and the fluid residence time, measured by the mass-weighted stream 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. Contrary to the steady-state behavior, the jet fluid mass fraction exhibits a linear increase with downstream distance in the decelerating jet, whereas the centerline mass-weighted stream age of jet fluid remains proportional to downstream distance. Scalar transport budget analysis shows that the radial transport term increases for both scalars, and that the contribution of the streamwise transport term of jet mass fraction changes sign between steady and unsteady cases.
1070-6631
Shin, Dong-hyuk
aefc1292-87fd-48ab-94bc-a857692ccabe
Aspden, A J
60fa8f03-cbc7-4d6d-9a2c-25fb93c515e8
Aparece-Scutariu, Vlad
c5219ec5-ad4f-4a5b-bef7-ec5b7e4ebd0b
Richardson, Edward
a8357516-e871-40d8-8a53-de7847aa2d08
Shin, Dong-hyuk
aefc1292-87fd-48ab-94bc-a857692ccabe
Aspden, A J
60fa8f03-cbc7-4d6d-9a2c-25fb93c515e8
Aparece-Scutariu, Vlad
c5219ec5-ad4f-4a5b-bef7-ec5b7e4ebd0b
Richardson, Edward
a8357516-e871-40d8-8a53-de7847aa2d08

Shin, Dong-hyuk, Aspden, A J, Aparece-Scutariu, Vlad and Richardson, Edward (2023) Unsteady self-similarity of jet fluid age and mass fraction. Physics of Fluids, 35 (1), [015139]. (doi:10.1063/5.0132042).

Record type: Article

Abstract

Scalar mixing is investigated in a decelerating turbulent round jet using direct numerical simulation. The main focus is to determine and model any new self-similar states in the unsteady flow as well as predict the centerline evolution of relevant flow quantities. The mass fraction of jet fluid and the fluid residence time, measured by the mass-weighted stream 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. Contrary to the steady-state behavior, the jet fluid mass fraction exhibits a linear increase with downstream distance in the decelerating jet, whereas the centerline mass-weighted stream age of jet fluid remains proportional to downstream distance. Scalar transport budget analysis shows that the radial transport term increases for both scalars, and that the contribution of the streamwise transport term of jet mass fraction changes sign between steady and unsteady cases.

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Accepted/In Press date: 28 December 2022
Published date: 17 January 2023

Identifiers

Local EPrints ID: 477276
URI: http://eprints.soton.ac.uk/id/eprint/477276
ISSN: 1070-6631
PURE UUID: c7a2a09c-3648-4776-9955-882148b03807
ORCID for Edward Richardson: ORCID iD orcid.org/0000-0002-7631-0377

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Date deposited: 01 Jun 2023 17:07
Last modified: 02 Aug 2023 01:54

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Contributors

Author: Dong-hyuk Shin
Author: A J Aspden
Author: Vlad Aparece-Scutariu

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