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We study the fully nonlinear, nonlocal dynamics of two-dimensionalmulticomponent vesicles in a shear flow with matched viscosity of the inner andouter fluids. Using a nonstiff, pseudo-spectral boundary integral method, weinvestigate dynamical patterns induced by inhomogeneous bending for a two phasesystem. Numerical results reveal that there exist novel phase-treading andtumbling mechanisms that cannot be observed for a homogeneous vesicle. Inparticular, unlike the well-known steady tank-treading dynamics characterizedby a fixed inclination angle, here the phase-treading mechanism leads tounsteady periodic dynamics with an oscillatory inclination angle. When theaverage phase concentration is around 1/2, we observe tumbling dynamics evenfor very low shear rate, and the excess length required for tumbling issignificantly smaller than the value for the single phase case. We summarizeour results in phase diagrams in terms of the excess length, shear rate, andconcentration of the soft phase. These findings go beyond the well knowndynamical regimes of a homogeneous vesicle and highlight the level ofcomplexity of vesicle dynamics in a fluid due to heterogeneous materialproperties.

Dynamics of a multicomponent vesicle in shear flow