Show simple item record

dc.contributor.authorAttili, Antonio
dc.contributor.authorCristancho, Juan
dc.contributor.authorBisetti, Fabrizio
dc.date.accessioned2015-08-03T11:55:03Z
dc.date.available2015-08-03T11:55:03Z
dc.date.issued2014-06-02
dc.identifier.issn14685248
dc.identifier.doi10.1080/14685248.2014.919394
dc.identifier.urihttp://hdl.handle.net/10754/563585
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.
dc.publisherInforma UK Limited
dc.subjectdirect numerical simulation
dc.subjectspatially developing mixing layer
dc.subjectturbulent/non-turbulent interface
dc.titleStatistics of the turbulent/non-turbulent interface in a spatially developing mixing layer
dc.typeArticle
dc.contributor.departmentClean Combustion Research Center
dc.contributor.departmentMechanical Engineering Program
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.contributor.departmentReactive Flow Modeling Laboratory (RFML)
dc.identifier.journalJournal of Turbulence
kaust.personAttili, Antonio
kaust.personCristancho, Juan
kaust.personBisetti, Fabrizio
dc.date.published-online2014-06-02
dc.date.published-print2014-09-02


This item appears in the following Collection(s)

Show simple item record