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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…
Motility-Induced Clustering and Meso-Scale Turbulence in Active Polar Fluids
Vasco M. Worlitzer, Gil Ariel, Avraham Be'er +3
Meso-scale turbulence was originally observed experimentally in various suspensions of swimming bacteria, as well as in the collective motion of active colloids. The corresponding…
Heterogeneous bacterial swarms with mixed lengths
Shlomit Peled, Shawn D. Ryan, Sebastian Heidenreich +3
Heterogeneous systems of active matter exhibit a range of complex emergent dynamical patterns. In particular, it is difficult to predict the properties of the mixed system based on…
A phase diagram for bacterial swarming
Avraham Be`er, Bella Ilkanaiv, Renan Gross +4
Bacterial swarming is a rapid mass-migration, in which thousands of cells spread collectively to colonize a surface. Physically, swarming is a natural example of active particles t…
Asymmetric pattern formation in microswimmer suspensions induced by orienting fields
Henning Reinken, Sebastian Heidenreich, Markus Bär +1
This paper studies the influence of orienting external fields on pattern formation, particularly mesoscale turbulence, in microswimmer suspensions. To this end, we apply a hydrodyn…
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…
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…
Meso-scale turbulence in living fluids
Henricus H. Wensink, Jörn Dunkel, Sebastian Heidenreich +4
Turbulence is ubiquitous, from oceanic currents to small-scale biological and quantum systems. Self-sustained turbulent motion in microbial suspensions presents an intriguing examp…
Minimal continuum theories of structure formation in dense active fluids
Jörn Dunkel, Sebastian Heidenreich, Markus Bär +1
Self-sustained dynamical phases of living matter can exhibit remarkable similarities over a wide range of scales, from mesoscopic vortex structures in microbial suspensions and mot…
Non-linear rheology of active particle suspensions: Insights from an analytical approach
Sebastian Heidenreich, Siegfried Hess, Sabine H. L. Klapp
We consider active suspensions in the isotropic phase subjected to a shear flow. Using a set of extended hydrodynamic equations we derive a variety of {\em analytical} expressions…