Statistics of the turbulent/non-turbulent interface in a spatially evolving mixing layer
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Juan Cristancho Final Thesis.pdf
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Cristancho, Juan Final Thesis
Type
ThesisAuthors
Cristancho, JuanAdvisors
Bisetti, Fabrizio
Committee members
Samtaney, Ravi
Thoroddsen, Sigurdur T

Program
Mechanical EngineeringKAUST Department
Physical Science and Engineering (PSE) DivisionDate
2012-12Embargo End Date
2015-01-01Permanent link to this record
http://hdl.handle.net/10754/277454
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At the time of archiving, the student author of this thesis opted to temporarily restrict access to it. The full text of this thesis became available to the public after the expiration of the embargo on 2015-01-01.Abstract
The thin interface separating the inner turbulent region from the outer irrotational fluid is analyzed 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. Velocity and passive scalar statistics are computed and compared to the results of studies addressing other shear flows, such as turbulent jets and wakes. The conditional statistics for velocity are in remarkable agreement with the results for other types of free shear flow available in the literature. In addition, a detailed analysis of the passive scalar field (with Sc 1) in the vicinity of the interface is presented. 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, but it is a new result for Schmidt number of order one. Finally, the dissipation for the kinetic energy and the scalar are presented. While the kinetic energy dissipation has its maximum far from the interface, the scalar dissipation is characterized by a strong peak very close to the interface.Citation
Cristancho, J. (2012). Statistics of the turbulent/non-turbulent interface in a spatially evolving mixing layer. KAUST Research Repository. https://doi.org/10.25781/KAUST-NHRR8ae974a485f413a2113503eed53cd6c53
10.25781/KAUST-NHRR8