title: Effect of thermal noise on vesicles and capsules in shear flow.
abstract: We add thermal noise consistently to reduced models of undeformable vesicles and capsules in shear flow and derive analytically the corresponding stochastic equations of motion. We calculate the steady-state probability distribution function and construct the corresponding phase diagrams for the different dynamical regimes. For fluid vesicles, we predict that at small shear rates thermal fluctuations induce a tumbling motion for any viscosity contrast. For elastic capsules, due to thermal mixing, an intermittent regime appears in regions where deterministic models predict only pure tank treading or tumbling.
authors.affiliation: II Institut für Theoretische Physik, Universität Stuttgart, 70550 Stuttgart, Germany.
authors.forename: David
authors.initials: D
authors.lastname: Abreu
authors.forename: Udo
authors.initials: U
authors.lastname: Seifert
mesh_terms: D003198:Computer Simulation; D055119:Elastic Modulus; D008954:Models, Biological; D015233:Models, Statistical; D033081:Shear Strength; D022161:Transport Vesicles / Q000737:chemistry*; D014783:Viscosity