Berlin 2018 – wissenschaftliches Programm

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BP: Fachverband Biologische Physik

BP 15: Postersession III

BP 15.91: Poster

Dienstag, 13. März 2018, 14:00–16:00, Poster B

Flow fields and motions of droplets driven by active filament-bound point forces — •Leon Rückert and Reiner Kree — Georg-August-Universität Göttingen, Institut für Theoretische Physik, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany

Active intracellular motion of cargo carrying motor proteins or active motion of biological or artificial microswimmers caged in droplets drive internal and external flow, which in principle may also lead to translational and rotational motion of the whole system.

Extending methods of previous work [1], we study the intra- and extracellular flow fields and the trajectories of droplets at low Reynolds numbers, which are generated by point forces inside the droplet. The point forces are assumed to actively move along rigid filamentary tracks. A special focus is put on force dipoles as models of myosin or kinesin motors.

We analytically calculate the flow fields, and the induced center of mass and angular velocity of the droplet for single point forces and dipoles, and discuss examples of motions, including stationary, periodic and random motion on simple geometries of filamentary tracks.

[1] R. Kree, P.S. Burada and A. Zippelius, J. Fluid. Mech. 821, 595-623 (2017)