Statistics of the turbulent/non-turbulent interface in a spatially developing mixing layer

Handle URI:
http://hdl.handle.net/10754/563585
Title:
Statistics of the turbulent/non-turbulent interface in a spatially developing mixing layer
Authors:
Attili, Antonio; Cristancho, Juan; Bisetti, Fabrizio ( 0000-0001-5162-7805 )
Abstract:
The thin interface separating the inner turbulent region from the outer irrotational fluid is analysed in a direct numerical simulation of a spatially developing turbulent mixing layer. A vorticity threshold is defined to detect the interface separating the turbulent from the non-turbulent regions of the flow, and to calculate statistics conditioned on the distance from this interface. The conditional statistics for velocity are in remarkable agreement with the results for other free shear flows available in the literature, such as turbulent jets and wakes. In addition, an analysis of the passive scalar field in the vicinity of the interface is presented. It is shown that the scalar has a jump at the interface, even stronger than that observed for velocity. The strong jump for the scalar has been observed before in the case of high Schmidt number (Sc). In the present study, such a strong jump is observed for a scalar with Sc ≈ 1. Conditional statistics of kinetic energy and scalar dissipation are presented. While the kinetic energy dissipation has its maximum far from the interface, the scalar dissipation is characterised by a strong peak very close to the interface. Finally, it is shown that the geometric features of the interfaces correlate with relatively large scale structures as visualised by low-pressure isosurfaces. © 2014 Taylor & Francis.
KAUST Department:
Clean Combustion Research Center; Physical Sciences and Engineering (PSE) Division; Mechanical Engineering Program; Reactive Flow Modeling Laboratory (RFML)
Publisher:
Informa UK Limited
Journal:
Journal of Turbulence
Issue Date:
2-Jun-2014
DOI:
10.1080/14685248.2014.919394
Type:
Article
ISSN:
14685248
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

Full metadata record

DC FieldValue Language
dc.contributor.authorAttili, Antonioen
dc.contributor.authorCristancho, Juanen
dc.contributor.authorBisetti, Fabrizioen
dc.date.accessioned2015-08-03T11:55:03Zen
dc.date.available2015-08-03T11:55:03Zen
dc.date.issued2014-06-02en
dc.identifier.issn14685248en
dc.identifier.doi10.1080/14685248.2014.919394en
dc.identifier.urihttp://hdl.handle.net/10754/563585en
dc.description.abstractThe thin interface separating the inner turbulent region from the outer irrotational fluid is analysed in a direct numerical simulation of a spatially developing turbulent mixing layer. A vorticity threshold is defined to detect the interface separating the turbulent from the non-turbulent regions of the flow, and to calculate statistics conditioned on the distance from this interface. The conditional statistics for velocity are in remarkable agreement with the results for other free shear flows available in the literature, such as turbulent jets and wakes. In addition, an analysis of the passive scalar field in the vicinity of the interface is presented. It is shown that the scalar has a jump at the interface, even stronger than that observed for velocity. The strong jump for the scalar has been observed before in the case of high Schmidt number (Sc). In the present study, such a strong jump is observed for a scalar with Sc ≈ 1. Conditional statistics of kinetic energy and scalar dissipation are presented. While the kinetic energy dissipation has its maximum far from the interface, the scalar dissipation is characterised by a strong peak very close to the interface. Finally, it is shown that the geometric features of the interfaces correlate with relatively large scale structures as visualised by low-pressure isosurfaces. © 2014 Taylor & Francis.en
dc.publisherInforma UK Limiteden
dc.subjectdirect numerical simulationen
dc.subjectspatially developing mixing layeren
dc.subjectturbulent/non-turbulent interfaceen
dc.titleStatistics of the turbulent/non-turbulent interface in a spatially developing mixing layeren
dc.typeArticleen
dc.contributor.departmentClean Combustion Research Centeren
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentMechanical Engineering Programen
dc.contributor.departmentReactive Flow Modeling Laboratory (RFML)en
dc.identifier.journalJournal of Turbulenceen
kaust.authorAttili, Antonioen
kaust.authorCristancho, Juanen
kaust.authorBisetti, Fabrizioen
All Items in KAUST are protected by copyright, with all rights reserved, unless otherwise indicated.