Change search
ReferencesLink to record
Permanent link

Direct link
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 (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
National Category
Fluid Mechanics and Acoustics
URN: urn:nbn:se:kth:diva-86827OAI: diva2:501054
7th International Symposium on Turbulence and Shear Flow Phenomena. 28-31 July 2011. Ottawa, Canada
QC 20120330Available from: 2012-02-13 Created: 2012-02-13 Last updated: 2012-03-30Bibliographically approved

Open Access in DiVA

No full text

Other links

Search in DiVA

By author/editor
Malm, JohanSchlatter, Philipp
By organisation
Fluid Mechanics and Acoustics

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 107 hits
ReferencesLink to record
Permanent link

Direct link