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Regensburg 2019 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 18: Fluid physics and turbulence

DY 18.1: Invited Talk

Tuesday, April 2, 2019, 10:00–10:30, H20

Bursting, amplitude explosions and mixed mode oscillations at the onset of shear flow turbulence — •Björn Hof1, Chaitanya Paranjape1, Yohann Duguet2, Vasudevan Mukund1, and Nazmi B Budanur11IST Austria — 2LIMSI-CNRS

In pipe and channel flows turbulence appears abruptly and the dynamics is immediately high dimensional. Where exactly turbulence originates from and how the turbulent patches characteristic for low Reynolds number turbulence develop has remained an open question for over a century. I will here discuss the different stages of the transition process starting from spatially localized exact coherent structures. In particular I am going to highlight the interplay between the fast fluctuation time scale and the slow recovery of shear, inherent to these structures. Following an explosive increase in fluctuation amplitude, a sharp rise in the attractor dimension is observed and subsequently a boundary crisis to transient chaos. This transition scenario results in localized turbulent transients that through interaction become sustained at a directed percolation phase transition.

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