Merging and auto-generation of vortices in wall bounded flow

Gerrit Elsinga, Manu Goudar Vishwanathappa, Wim-Paul Breugem

Research output: Contribution to journalMeeting AbstractScientific

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 evolution of two eddies with different initial strengths (but both below the threshold strength), initial sizes and initial stream-wise spacing between them. The numerical procedure followed is similar to Zhou et al [1]. 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 stream-wise 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. \\[4pt] [1] J. Zhou, R.J. Adrian, S. Balachandar, and T.M. Kendall, Journal of Fluid Mechanics, 387:353-396, 1999.
Original languageEnglish
Article numberD20.00003
JournalAmerican Physical Society. Bulletin
Volume57
Issue number17
Publication statusPublished - 2012
Event65th Annual Meeting of the APS Division of Fluid Dynamics - s.l., San Diego, California, United States
Duration: 18 Nov 201220 Nov 2012

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