Auto-generation by interaction of weak eddies

Auto-generation by interaction of weak eddies

Goudar Vishwanathappa, M. (TU Delft Fluid Mechanics)
Breugem, W.P. (TU Delft Multi Phase Systems)
Jodai, Y. (National College of Technology)
Elsinga, G.E. (TU Delft Fluid Mechanics)

Floryan, J.M. (editor)
Tvergaard, V. (editor)
van Campen, D. (editor)

2016

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].

auto-generation
boundary layers

http://resolver.tudelft.nl/uuid:f9f54382-0bda-4a60-8535-0d09a6fd4348

Proceedings of the 24th International Congress of Theoretical and Applied Mechanics

24th International Congress of Theoretical and Applied Mechanics (ICTAM), 2016-08-21 → 2016-08-26, Montreal, Canada

Institutional Repository

conference paper

© 2016 M. Goudar Vishwanathappa, W.P. Breugem, Y. Jodai, G.E. Elsinga