SKM 2023 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 38: Microswimmers and Fluid Physics of Life (joint session DY/CPP)

CPP 38.2: Vortrag

Mittwoch, 29. März 2023, 15:15–15:30, MOL 213

Turbulence induces clustering and arrested phase separation in polar active fluidsVasco Worlitzer1,2, Gil Ariel2, Avraham Beer3, Holger Stark4, •Markus Bär1,4, and Sebastian Heidenreich11Physikalisch-Technische Bundesanstalt, Berlin — 2Bar-Ilan University, Ramat Gan, Israel — 3Ben-Gurion University, Beer Sheva, Israel — 4Technische Universität Berlin

We study a novel phase of active polar fluids, which is characterized by the continuous creation and destruction of dense clusters due to self-sustained turbulence. This state arises due to the interplay between self-advection of the aligned swimmers and their defect topology. The typical cluster size is determined by the characteristic vortex size. Our results are obtained by investigating a continuum model of compressible polar active fluids [1], which incorporates typical experimental observations in bacterial suspensions [2], in particular a non-monotone dependence of speed on density.

[1] V. Worlitzer et al., Soft Matter 17, 10447-10457 (2021)

[2] A. Beer et al., Communications Physics 3, 66 (2020)

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