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DY: Fachverband Dynamik und Statistische Physik

DY 41: Poster - Pattern/ Nonlinear Dyn./ Fluids/ Granular/ Critical Phen.

DY 41.19: Poster

Donnerstag, 3. April 2014, 17:00–19:00, P3

Quasiperiodic and chaotic motion of active particles in Poiseuille flow — •Igor Dudas, Andreas Zöttl, and Holger Stark — TU Berlin

Active particles have an intrinsic propulsion mechanism which constantly keeps them out of equilibrium. They swim with a constant velocity while the swimming direction can be manipulated by an external field. In this contribution we demonstrate that an active particle swimming in Poiseuille flow exhibits typical nonlinear dynamics mainly driven by the cross-streamline migration due to activity [1,2]. Our model system can be mapped onto a Hamiltonian system equivalent to the nonlinear pendulum. Bounding surfaces introduce dissipation while swimmers in Poiseuille flow with elliptic cross section exhibit quasiperiodic and chaotic behavior depending on the flow velocity and initial conditions.
A. Zöttl and H. Stark, Phys. Rev. Lett. 108, 218104 (2012).
A. Zöttl and H. Stark, Eur. Phys. J. E 36, 4 (2013).