BPCPPDYSOE21 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 27: Fluid Physics 3 - organized by Stephan Weiss and Michael Wilczek (Göttingen)
DY 27.4: Vortrag
Dienstag, 23. März 2021, 15:10–15:30, DYa
Boundary conditions for polar active fluids exhibiting mesoscale turbulence — •Sebastian Heidenreich1, Henning Reinken2, Daiki Nishiguchi3, Andrey Sololov4, Igor S. Aranson5, and Sabine H. L. Klapp2 — 1Physikalisch Technische Bundesanstalt Braunschweig und Berlin, Germany — 2Technische Universität Berlin, Germany — 3University of Tokyo, Japan — 4Argonne National Laboratory, USA — 5Pennsylvania State University, USA
Bacterial suspensions are intriguing examples for active polar fluids which exhibit large-scale collective behaviour from mesoscale turbu- lence to vortex lattices. The bulk collective motion is well described by a continuum equation with derivatives up to the fourth order [1]. That simple model reproduces experimental findings of mesoscale turbulence and was recently derived from a minimal micro-swimmer model. How- ever, the treatment of boundaries to describe the collective motion in a confinement or near walls remains so far unknown. In the talk, we propose boundary conditions for active polar fluids suitable to de- scribe recent experiments of Bacillus subtilis bacteria moving in an array of lithographic designed pillars [2]. Furthermore, we describe the collective motion of bacteria around single pillars of different sizes in experiments and show that the model with the mentioned boundary conditions reproduces this behavior faithfully.
[1] J. Dunkel, S. Heidenreich, M. Bär and R. E. Goldstein, New. J. Phys. 15, 040516 (2013). [2] D. Nishiguchi, I. S. Aranson, A. Snezhko and A. Sokolov Nat. Comm. 9, 4486 (2018).