Viskoelatische Instabilität von Poiseuilleströmung

• Antragsteller: Professor Dr. Christian Wagner
• Fachliche Zuordnung: Statistische Physik, Nichtlineare Dynamik, Komplexe Systeme, Weiche und fluide Materie, Biologische Physik ; Experimentelle Physik der kondensierten Materie
• Förderung: Förderung von 2010 bis 2017
• Projektkennung: Deutsche Forschungsgemeinschaft (DFG) - Projektnummer 157269621

• Erstellungsjahr: 2018

Zusammenfassung der Projektergebnisse

In summary, we have characterised the bifurcation scenario of the primary threshold of the viscoelastic instability in a curvilinear channel. We could show that the instability sets in at decreasing critical Weissenberg number Wic along the channel. Closer to the entry of the channel we observed an imperfect bifurcation and only at later positions a simple forward bifurcation. We found a pronounced oscillatory behaviour that has been predicted numerically before. Thus, we thus classify the transition as a Hopf bifurcation, and only with increasing driving strength the oscillation amplitudes and frequencies become time dependent until a featureless state of viscoelstic turbulence is reached.

Projektbezogene Publikationen (Auswahl)

• Elasto-inertial turbulence. PNAS 110, 10557 (2013)
  D. Samanta, Y. Dubief, M. Holzner, C. Schaefer, A. Morozov, C. Wagner, and B. Hof
  (Siehe online unter https://doi.org/10.1073/pnas.1219666110)