Abstract
Abstract This paper is concerned with the nonlinear dynamics of multicomponent vesicles in a time-dependent elongational flow. Using a nonstiff, pseudospectral boundary integral method, we investigate the dynamical patterns induced by negative surface tension and inhomogeneous bending for a two phases system. For both quasi-circular and elongated vesicles, high frequency wrinkles can be excited in flow with strong elongational rate after the flow’s direction is reversed. Unevenly distributed phase diagram leads to asymmetric wrinkling pattern, and the characteristic wavelength for each phase is well reserved. In weak flow, bucking behaviours are observed for elongated vesicles and the membrane bends inward at regions with lower bending moduli.
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