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.
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
17 January 2023
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).
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
Additional Information:
Funding Information:
This work was performed with support from the EPSRC (Grant Nos. EP/L002698/1, EP/M001482/1, and EP/I004564/1), the Underground City of the Future Program funded by the Ministry of Science and ICT of the Republic of Korea, and using resources of the UK National High Performance Computing Facility (ARCHER) (Grant No. EP/K024876/1).
Publisher Copyright:
© 2023 Author(s).
Identifiers
Local EPrints ID: 477276
URI: http://eprints.soton.ac.uk/id/eprint/477276
ISSN: 1070-6631
PURE UUID: c7a2a09c-3648-4776-9955-882148b03807
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Date deposited: 01 Jun 2023 17:07
Last modified: 11 May 2024 01:44
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Author:
Dong-hyuk Shin
Author:
A J Aspden
Author:
Vlad Aparece-Scutariu
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