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Pattern selection and the route to turbulence in incompressible polar active fluids
Henning Reinken, Sebastian Heidenreich, Markus Bär +1
Active fluids, such as suspensions of microswimmers, are known to self-organize into complex spatio-temporal flow patterns. An intriguing example is mesoscale turbulence, a state o…
Turbulence-induced clustering in compressible active fluids
Vasco M. Worlitzer, Gil Ariel, Avraham Be'er +3
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 aris…
Ising-like critical behavior of vortex lattices in an active fluid
Henning Reinken, Sebastian Heidenreich, Markus Bär +1
Turbulent vortex structures emerging in bacterial active fluids can be organized into regular vortex lattices by weak geometrical constraints such as obstacles. Here we show, using…
Derivation of a hydrodynamic theory for mesoscale dynamics in microswimmer suspensions
Henning Reinken, Sabine H. L. Klapp, Markus Bär +1
In this paper we systematically derive a fourth-order continuum theory capable of reproducing mesoscale turbulence in a three-dimensional suspension of microswimmers. We start from…
Hydrodynamic length-scale selection and effective viscosity in microswimmer suspensions
Sebastian Heidenreich, Jörn Dunkel, Sabine H. L. Klapp +1
A universal characteristic of mesoscale turbulence in active suspensions is the emergence of a typical vortex length scale, distinctly different from the scale-invariance of turbul…
Pattern formation in active particle systems due to competing alignment interactions
Robert Großmann, Pawel Romanczuk, Markus Bär +1
Recently, we proposed a self-propelled particle model with competing alignment interactions: nearby particles tend to align their velocities whereas they anti-align their direction…
Vortex arrays and meso-scale turbulence of self-propelled particles
Robert Grossmann, Pawel Romanczuk, Markus Bär +1
Inspired by the Turing mechanism for pattern formation, we propose a simple self-propelled particle model with short-ranged alignment and anti-alignment at larger distances. It is…
Fluid dynamics of bacterial turbulence
Jörn Dunkel, Sebastian Heidenreich, Knut Drescher +3
Self-sustained turbulent structures have been observed in a wide range of living fluids, yet no quantitative theory exists to explain their properties. We report experiments on act…
Large-scale collective properties of self-propelled rods
F. Ginelli, F. Peruani, M. Baer +1
We study, in two space dimensions, the large-scale properties of collections of constant-speed polar point particles interacting locally by nematic alignment in the presence of noi…