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A vorticity stretching diagnostic for turbulent flows
KTH, School of Engineering Sciences (SCI), Mechanics.
KTH, School of Engineering Sciences (SCI), Mechanics.ORCID iD: 0000-0001-9627-5903
2011 (English)In: Proc. 7th International Symposium on Turbulence and Shear Flow Phenomena, 2011Conference paper, Published paper (Refereed)
Abstract [en]

Vorticity stretching in wall-bounded turbulent and transitionalflows has been investigated by means of a new diagnostic,designed to pick up regions with large amounts of vorticitystretching. It was found that the largest occurrence ofvorticity stretching in fully turbulent channel flows is presentat a wall-normal distance of y+ = 6.5, i.e. in the transitionbetween the viscous sublayer and the buffer region. Instantaneousdata showed that the coherent structures associated withthese stretching events have the shape of flat ‘pancake structures’in the vicinity of high-speed streaks, here denoted ‘htype’events. The other event found, also studied in an asymptoticsuction boundary layer, is the ‘l-type’ event present ontop of an unstable low-speed streak. These events are furtherthought to be associated with the exponential growth ofstreamwise vorticity in the turbulent near-wall cycle.

Place, publisher, year, edition, pages
2011.
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-86827OAI: oai:DiVA.org:kth-86827DiVA: diva2:501054
Conference
7th International Symposium on Turbulence and Shear Flow Phenomena. 28-31 July 2011. Ottawa, Canada
Note
QC 20120330Available from: 2012-02-13 Created: 2012-02-13 Last updated: 2012-03-30Bibliographically approved

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http://www.tsfp7.org/papers/3A5P.pdf

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Schlatter, Philipp

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