title: Generation of stationary and moving vortices in active polar fluids in the planar Taylor-Couette geometry.
abstract: We study the dynamics of an active polar fluid in the interstitial space between two fixed coaxial cylinders. For sufficiently large expansive or contractive active stresses, the fluid presents roll instabilities of axially symmetric states leading to the spontaneous formation of vortices in the flow field. These vortices are either stationary or travel around the inner cylinder. Increasing the activity further, our numerical solutions indicate the existence of active turbulence that coexists with regular vortex solutions.
authors.affiliation: Theoretische Physik, Universität des Saarlandes, Postfach 151150, 66041 Saarbrücken, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Neef
authors.affiliation: Theoretische Physik, Universität des Saarlandes, Postfach 151150, 66041 Saarbrücken, Germany.
authors.forename: K
authors.initials: K
authors.lastname: Kruse