Abstract
A nonequilibrium molecular dynamics (NEMD) method is employed to study dynamical behaviors of a two-dimensional (2D) vesicle grafted by two polymers in shear flow. Besides tumbling, trembling, and tank-treading, a new translating motion of polymer-grafted vesicles is observed, which mainly depends on the shear rate, the polymer length and the grafting position. In the translating regime, the grafting polymers stretch away from the vesicle, both the vesicle and the fully stretched polymers keep the translational motion with the same velocity, and the expected rotation or circulation of the vesicle in shear flow is eliminated. This investigation can help us to understand the complexity of vesicle motions in shear flows.
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