Henning Reinken
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View article: Rheologically Tuned Modes of Collective Transport in Active Viscoelastic Films
Rheologically Tuned Modes of Collective Transport in Active Viscoelastic Films Open
While many living biological media combine both viscous and elastic properties, most theoretical studies employ either purely fluid or solidlike descriptions. We here use a unified framework for active films on substrates capable of descri…
View article: Unified description of viscous, viscoelastic, or elastic thin active films on substrates
Unified description of viscous, viscoelastic, or elastic thin active films on substrates Open
It is frequent for active or living entities to find themselves embedded in a surrounding medium. Resulting composite systems are usually classified as either active fluids or active solids. Yet, in reality, particularly in the biological …
View article: Self-sustained patchy turbulence in shear-thinning active fluids
Self-sustained patchy turbulence in shear-thinning active fluids Open
Bacterial suspensions and other active fluids are known to develop highly dynamical vortex states, denoted as active or mesoscale turbulence. We reveal the pronounced effect of non-Newtonian rheological conditions on these turbulent states…
View article: Oscillatory collective motion in viscoelastic and elastic active fluids and solids under circular confinement
Oscillatory collective motion in viscoelastic and elastic active fluids and solids under circular confinement Open
In an inspiring recent study, Xu et al. [Nat. Phys. 19, 46 (2023)] observed for a living active biofilm under circular confinement two emergent dynamic modes of collective motion in the film. One corresponds to global rotational motion of …
View article: Rheologically tuned modes of collective transport in active viscoelastic films
Rheologically tuned modes of collective transport in active viscoelastic films Open
While many living biological media combine both viscous and elastic properties, most theoretical studies employ either purely fluid- or solid-like descriptions. We here use a unified framework for active films on substrates capable of desc…
View article: Unified description of viscous, viscoelastic, or elastic thin active films on substrates
Unified description of viscous, viscoelastic, or elastic thin active films on substrates Open
It is frequent for active or living entities to find themselves embedded in a surrounding medium. Resulting composite systems are usually classified as either active fluids or active solids. Yet, in reality, particularly in the biological …
View article: Self-sustained patchy turbulence in shear-thinning active fluids
Self-sustained patchy turbulence in shear-thinning active fluids Open
Bacterial suspensions and other active fluids are known to develop highly dynamical vortex states, denoted as active or mesoscale turbulence. We reveal the pronounced effect of non-Newtonian rheological conditions on these turbulent states…
View article: Thin elastic films and membranes under rectangular confinement
Thin elastic films and membranes under rectangular confinement Open
We address the deformations within a thin elastic film or membrane in a two-dimensional rectangular confinement. To this end, analytical considerations of the Navier-Cauchy equations describing linear elasticity are performed in the presen…
View article: Pattern selection and the route to turbulence in incompressible polar active fluids
Pattern selection and the route to turbulence in incompressible polar active fluids Open
Active fluids, such as suspensions of microswimmers, are well known to self-organize into complex spatio-temporal flow patterns. An intriguing example is mesoscale turbulence, a state of dynamic vortex structures exhibiting a characteristi…
View article: Vortex Pattern Stabilization in Thin Films Resulting from Shear Thickening of Active Suspensions
Vortex Pattern Stabilization in Thin Films Resulting from Shear Thickening of Active Suspensions Open
The need for structuring on micrometer scales is abundant, for example, in\nview of phononic applications. We here outline a novel approach based on the\nphenomenon of active turbulence on the mesoscale. As we demonstrate, a\nshear-thicken…
View article: Pattern selection and the route to turbulence in incompressible polar active fluids
Pattern selection and the route to turbulence in incompressible polar active fluids Open
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 of dynamic vortex structures exhibiting a characteristic len…
View article: Optimal turbulent transport in microswimmer suspensions
Optimal turbulent transport in microswimmer suspensions Open
Microswimmer suspensions self-organize into complex spatio-temporal flow patterns, including vortex lattices and mesoscale turbulence. Here we explore the consequences for the motion of passive tracers, based on a continuum model for the m…
View article: Ising-like Critical Behavior of Vortex Lattices in an Active Fluid
Ising-like Critical Behavior of Vortex Lattices in an Active Fluid Open
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 a continuum-theoretical approach, that the formation and d…
View article: Organizing bacterial vortex lattices by periodic obstacle arrays
Organizing bacterial vortex lattices by periodic obstacle arrays Open
Recent experiments have shown that the complex spatio-temporal vortex structures emerging in active fluids are susceptible to weak geometrical constraints. This observation poses the fundamental question of how boundary effects stabilize a…
View article: Derivation of a hydrodynamic theory for mesoscale dynamics in microswimmer suspensions
Derivation of a hydrodynamic theory for mesoscale dynamics in microswimmer suspensions Open
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 overdamped Langevin equations for a generic microscopic m…
View article: Shear banding in nematogenic fluids with oscillating orientational dynamics
Shear banding in nematogenic fluids with oscillating orientational dynamics Open
We investigate the occurrence of shear banding in nematogenic fluids under planar Couette flow, based on mesoscopic dynamical equations for the orientational order parameter and the shear stress. We focus on parameter values where the shea…
View article: Shear banding in nematogenic fluids with oscillating orientational\n dynamics
Shear banding in nematogenic fluids with oscillating orientational\n dynamics Open
We investigate the occurrence of shear banding in nematogenic fluids under\nplanar Couette flow, based on mesoscopic dynamical equations for the\norientational order parameter and the shear stress. We focus on parameter\nvalues where the s…
View article: Shear banding in nematogenic fluids with oscillating orientational dynamics
Shear banding in nematogenic fluids with oscillating orientational dynamics Open
We investigate the occurrence of shear banding in nematogenic fluids under planar Couette flow, based on mesoscopic dynamical equations for the orientational order parameter and the shear stress. We focus on parameter values where the shea…