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BP: Fachverband Biologische Physik

BP 16: Poster IV

BP 16.10: Poster

Dienstag, 17. März 2020, 14:00–16:00, P2/EG

Turbulence in a suspension of active rods — •Osamah Sufyan, Josua Grawitter, and Holger Stark — Technische Universität Berlin, Institut für Theoretische Physik, Hardenbergstraße 36, 10623 Berlin, Germany

Self-organizing active systems can exhibit non-equilibrium phase transitions, e.g., from ordered collective motion to spatio-temporal chaos as in motility assays of biofilaments and bacterial suspensions. An interesting phenomenon in such systems is the emergence of active turbulence at small Reynolds numbers [1].

Here, we investigate the collective dynamics of a dilute suspension of active rods in a viscous fluid using the incompressible Navier-Stokes equation coupled to the dynamic equation for the local tensorial order parameter, which quantifies the liquid-crystal nematic order of the active rods [2,3]. We numerically solve the model equations. With increasing activity, we identify a transition from an isotropic to a turbulent phase. We characterize this phase by the scaling law of the local nematic order parameter, the power spectrum of the flow-field fluctuations, as well as the dynamics and statistics of the topological defects in the nematic director field.
[1]L. Giomi, Phys. Rev. X 5, 03100 (2015).
[2]S. Ramaswamy, Annu. Rev. Condens. Matter Phys. 1, 323 (2010).
[3]E. L. C. VI M. Plan, S. Musacchio, and D. Vincenzi, Phys. Rev. E 96, 053108 (2017).