Berlin 2018 – wissenschaftliches Programm
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BP: Fachverband Biologische Physik
BP 4: Active Matter DY I (joint session DY/CPP/BP)
BP 4.7: Vortrag
Montag, 12. März 2018, 11:45–12:00, BH-N 243
Turbulence and pattern formation in a minimal model for active fluids — •Martin James1, Wouter Bos2, and Michael Wilczek1 — 1Max Planck Institute for Dynamics and Self-Organization, Göttingen, Germany — 2LMFA, CNRS, Ècole Centrale de Lyon, France
Continuum theories of active fluids display a fascinating range of dynamical states, including stationary patterns and turbulent phases. While the former can be tackled with classical pattern formation theory, the spatio-temporal disorder of active turbulence calls for a statistical description. In this presentation, new results on turbulence and pattern formation in a minimal continuum model for active fluids, which has been recently proposed by Wensink et al. [PNAS 109(36):14308 (2012)], will be discussed. Adopting techniques from turbulence theory, we establish a quantitative description of correlation functions and spectra for active turbulence. We furthermore report on a novel type of turbulence-driven pattern formation far beyond linear onset: the emergence of a dynamic vortex lattice state after an extended turbulent transient, which can only be explained taking into account turbulent energy transfer across scales.