  The dynamics and rheology of a vesicle confined in a channel under shear flow
are studied at finite temperature. The effect of finite temperature on vesicle
motion and system viscosity is investigated. A two-dimensional numerical model,
which includes thermal fluctuations and is based on a combination of molecular
dynamics and mesoscopic hydrodynamics, is used to perform a detailed analysis
in a wide range of the Peclet numbers (the ratio of the shear rate to the
rotational diffusion coefficient). The suspension viscosity is found to be a
monotonous increasing function of the viscosity contrast (the ratio of the
viscosity of the encapsulated fluid to that of the surrounding fluid) both in
the tank-treading and the tumbling regime due to the interplay of different
temperature-depending mechanisms. Thermal effects induce shape and inclination
fluctuations of the vesicle which experiences also Brownian diffusion across
the channel increasing the viscosity. These effects reduces when increasing the
Peclet number.
