Merging and auto-generation of vortices in wall bounded flows

Title

Merging and auto-generation of vortices in wall bounded flows

 Author

Goudar Vishwanathappa, M. (TU Delft Fluid Mechanics)
Breugem, W.P. (TU Delft Fluid Mechanics) ORCID 0000-0003-0788-2862
Elsinga, G.E. (TU Delft Fluid Mechanics) ORCID 0000-0001-6717-5284

 Contributor

Johansson, AV (editor)
Friedrich, R (editor)
Tavoularis, S (editor)

Date

2013

 Abstract

For channel flow, we explore how a hairpin eddy may reach a threshold strength required to produce additional hairpins by means of auto-generation. This is done by studying the interaction of two eddies with different initial strengths (but both below the threshold strength), initial sizes and initial streamwise spacing between them. The numerical procedure followed is similar to Zhou et al. (1999). The two eddies were found to merge into a single stronger
eddy in case of a larger upstream and a smaller downstream eddy placed within a certain initial streamwise separation distance. Subsequently, the resulting stronger eddy was observed to auto-generate new eddies. Merging of eddies thus is a viable explanation for the creation of the threshold strength eddies.

 To reference this document use:

http://resolver.tudelft.nl/uuid:3a597fae-87d4-4f84-b60c-2462fd208de5

 Publisher

Technical University of Munich, Munich, Germany

 Source

Proceedings 8th International Symposium on Turbulence and Shear Flow Phenomena

 Event

TSFP-8, Poitiers, France, 2013-08-28 → 2013-08-30, Munich, Germany

 Part of collection

Institutional Repository

 Document type

conference paper

 Rights

© 2013 M. Goudar Vishwanathappa, W.P. Breugem, G.E. Elsinga
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