Hdl Handle:
http://hdl.handle.net/10545/620641
Title:
Large-eddy simulation of transitional flows using a co-located grid
Authors:
Langari, Mostafa; Yang, Zhiyin ( 0000-0002-6629-1360 ) ; Page, Gary J.
Abstract:
A large-eddy simulation (LES) of a transitional separated flow over a plate with a semi-circular leading at low (<0.2%) and high (5.6%) free-stream turbulence (FST) has been performed, using a co-located grid with the Rhie–Chow pressure smoothing. A numerical trip is used to produce a high FST level and a dynamic subgrid-scale model is also employed in the current study. The entire transition process leading to breakdown to turbulence has been shown clearly by the flow visualisations using instantaneous spanwise vorticities, and the differences between the low- and high-FST cases are clearly visible. Coherent structures are also visualised using isosurfaces of the Q-criterion, and for the high-FST case, the spanwise-oriented quasi-two-dimensional rolls, which are clearly present in the low-FST case, are not visible anymore. Detailed quantitative comparisons between the present LES results and experimental data and the previous LES results at low FST using a staggered grid have been done and a good agreement has been obtained, indicating that the current LES using a co-located grid with pressure smoothing can also predict transitional flows accurately.
Affiliation:
University of Sussex, Brighton, UK; University of Derby, UK
Citation:
Langari, Mostafa, Yang, Zhiyin, Page, Gary J., 'Large-eddy simulation of transitional flows using a co-located grid' 2013, 27 (4-5):189 International Journal of Computational Fluid Dynamics
Publisher:
Taylor and Francis
Journal:
International Journal of Computational Fluid Dynamics
Issue Date:
12-Jul-2013
URI:
http://hdl.handle.net/10545/620641
DOI:
10.1080/10618562.2013.799666
Additional Links:
http://www.tandfonline.com/doi/abs/10.1080/10618562.2013.799666
Type:
Article
Language:
en
ISSN:
1061-8562; 1029-0257
Appears in Collections:
Department of Mechanical Engineering & the Built Environment

Full metadata record

DC FieldValue Language
dc.contributor.authorLangari, Mostafaen
dc.contributor.authorYang, Zhiyinen
dc.contributor.authorPage, Gary J.en
dc.date.accessioned2016-10-17T19:53:03Z-
dc.date.available2016-10-17T19:53:03Z-
dc.date.issued2013-07-12-
dc.identifier.citationLangari, Mostafa, Yang, Zhiyin, Page, Gary J., 'Large-eddy simulation of transitional flows using a co-located grid' 2013, 27 (4-5):189 International Journal of Computational Fluid Dynamicsen
dc.identifier.issn1061-8562-
dc.identifier.issn1029-0257-
dc.identifier.doi10.1080/10618562.2013.799666-
dc.identifier.urihttp://hdl.handle.net/10545/620641-
dc.description.abstractA large-eddy simulation (LES) of a transitional separated flow over a plate with a semi-circular leading at low (<0.2%) and high (5.6%) free-stream turbulence (FST) has been performed, using a co-located grid with the Rhie–Chow pressure smoothing. A numerical trip is used to produce a high FST level and a dynamic subgrid-scale model is also employed in the current study. The entire transition process leading to breakdown to turbulence has been shown clearly by the flow visualisations using instantaneous spanwise vorticities, and the differences between the low- and high-FST cases are clearly visible. Coherent structures are also visualised using isosurfaces of the Q-criterion, and for the high-FST case, the spanwise-oriented quasi-two-dimensional rolls, which are clearly present in the low-FST case, are not visible anymore. Detailed quantitative comparisons between the present LES results and experimental data and the previous LES results at low FST using a staggered grid have been done and a good agreement has been obtained, indicating that the current LES using a co-located grid with pressure smoothing can also predict transitional flows accurately.en
dc.language.isoenen
dc.publisherTaylor and Francisen
dc.relation.urlhttp://www.tandfonline.com/doi/abs/10.1080/10618562.2013.799666en
dc.rightsArchived with thanks to International Journal of Computational Fluid Dynamicsen
dc.subjectLESen
dc.subjectTransitionen
dc.subjectCo-located griden
dc.subjectPressure smoothingen
dc.subjectTransitional flowsen
dc.titleLarge-eddy simulation of transitional flows using a co-located griden
dc.typeArticleen
dc.contributor.departmentUniversity of Sussex, Brighton, UKen
dc.contributor.departmentUniversity of Derby, UKen
dc.identifier.journalInternational Journal of Computational Fluid Dynamicsen
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