SKM 2023 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 31: Microswimmers and Fluid Physics of Life (joint session DY/CPP)
DY 31.2: Vortrag
Mittwoch, 29. März 2023, 15:15–15:30, MOL 213
Turbulence induces clustering and arrested phase separation in polar active fluids — Vasco Worlitzer1,2, Gil Ariel2, Avraham Beer3, Holger Stark4, •Markus Bär1,4, and Sebastian Heidenreich1 — 1Physikalisch-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)