Gilliland, T, Ranga-Dinesh, KKJ, Fairweather, M et al. (3 more authors) (2012) External intermittency simulation in turbulent round jets. Flow, Turbulence and Combustion, 89 (3). 385 - 406. ISSN 1386-6184
Abstract
Direct numerical and large eddy simulation (DNS and LES) are applied to study passive scalar mixing and intermittency in turbulent round jets. Both simulation techniques are applied to the case of a low Reynolds number jet with Re = 2,400, whilst LES is also used to predict a high Re = 68,000 flow. Comparison between time-averaged results for the scalar field of the low Re case demonstrate reasonable agreement between the DNS and LES, and with experimental data and the predictions of other authors. Scalar probability density functions (pdfs) for this jet derived from the simulations are also in reasonable accord, although the DNS results demonstrate the more rapid influence of scalar intermittency with radial distance in the jet. This is reflected in derived intermittency profiles, with LES generally giving profiles that are too broad compared to equivalent DNS results, with too low a rate of decay with radial distance. In contrast, good agreement is in general found between LES predictions and experimental data for the mixing field, scalar pdfs and external intermittency in the high Reynolds number jet. Overall, the work described indicates that improved sub-grid scale modelling for use with LES may be beneficial in improving the accuracy of external intermittency predictions by this technique over the wide range of Reynolds numbers of practical interest.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2012, Springer. This is an author produced version of a paper published in Flow, Turbulence and Combustion. Uploaded in accordance with the publisher's self-archiving policy. The final publication is available at Springer via http://dx.doi.org/10.1007/s10494-012-9403-2 |
Keywords: | DNS; Intermittency; LES; Round jet; Scalar field |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemical & Process Engineering (Leeds) > Institute for Particle Science and Engineering (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 17 Dec 2014 13:47 |
Last Modified: | 18 Jan 2018 17:55 |
Published Version: | http://dx.doi.org/10.1007/s10494-012-9403-2 |
Status: | Published |
Publisher: | Springer Verlag |
Identification Number: | 10.1007/s10494-012-9403-2 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:82229 |