Swinging and tumbling of fluid vesicles in shear flow.
The dynamics of fluid vesicles in simple shear flow is studied using mesoscale simulations of dynamically triangulated surfaces, as well as a theoretical approach based on two variables: a shape parameter and the inclination angle, which has no adjustable parameters. We show that, between the well-known tank-treading and tumbling states, a new "swinging" state can appear. We predict the dynamic phase diagram as a function of the shear rate, the viscosities of the membrane and the internal fluid, and the reduced vesicle volume. Our results agree well with recent experiments.
Noguchi
Hiroshi
H
Institut für Festkörperforschung, Forschungszentrum Jülich, 52425 Jülich, Germany.
Gompper
Gerhard
G
D000465:Algorithms; D002214:Capsules; D004548:Elasticity; D004912:Erythrocytes / Q000737:chemistry; D015233:Models, Statistical; D017711:Nonlinear Dynamics; D012212:Rheology / Q000706:statistics & numerical data*; D014783:Viscosity
D002214:Capsules