Swinging and tumbling of fluid vesicles in shear flow
Hiroshi Noguchi1, Gerhard Gompper
1Institut für Festkörperforschung, Forschungszentrum Jülich, 52425 Jülich, Germany.
Abstract:
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.
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