The University of Southampton
University of Southampton Institutional Repository

Self-similarity of passive scalars in a decelerating jet

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.
TSFP
Shin, D
214c77cf-b4fa-4576-9941-a4bf79ce3c41
Aspden, Andrew
7353e0e9-fbed-4f5a-a610-b045cd4cd576
Richardson, Edward
a8357516-e871-40d8-8a53-de7847aa2d08
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, TSFP..

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.

Text
Shin_JetScalars_TSFP10_2017 - Accepted Manuscript
Restricted to Repository staff only
Request a copy

More information

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, Chicago, United States, 2017-07-06 - 2017-07-09
Organisations: Mathematical Sciences, Aerodynamics & Flight Mechanics Group

Identifiers

Local EPrints ID: 410550
URI: http://eprints.soton.ac.uk/id/eprint/410550
PURE UUID: 9f79abe1-89c3-4a68-8776-376503767a9e

Catalogue record

Date deposited: 09 Jun 2017 09:04
Last modified: 19 Jul 2019 17:28

Export record

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×