Abstract
For channel flow, we explore how the interaction of weak eddies produces additional eddies by means of auto-generation. This is done by DNS of two eddies with different initial strengths, initial sizes and initial stream-wise spacing between them. The numerical procedure followed is similar to Zhou et al[1]. The two eddies merge into a single stronger eddy when a larger upstream and a smaller downstream eddy are placed within a certain initial stream-wise separation distance. Subsequently, the resulting stronger eddy is observed to auto-generate new eddies. The non-merging cases with small initial stream wise separation also auto-generate. The auto-generation is characterized by a rapid lift-up of an initial eddy, which blocks the incoming flow and leads to shear- layer roll-up and formation of a new eddy. The same sequence of events is observed in a fully developed turbulent boundary layer[2].
Original language | English |
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Title of host publication | Proceedings of the 24th International Congress of Theoretical and Applied Mechanics |
Editors | J.M. Floryan, V. Tvergaard, D. van Campen |
Number of pages | 2 |
Publication status | Published - 2016 |
Event | 24th International Congress of Theoretical and Applied Mechanics (ICTAM) - Montreal, Canada Duration: 21 Aug 2016 → 26 Aug 2016 Conference number: 24 |
Conference
Conference | 24th International Congress of Theoretical and Applied Mechanics (ICTAM) |
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Abbreviated title | ICTAM 2016 |
Country/Territory | Canada |
City | Montreal |
Period | 21/08/16 → 26/08/16 |
Keywords
- auto-generation
- boundary layers