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The dynamics of fluid vesicles is studied under flow in microchannels, inwhich the width varies periodically along the channel. Three types of flowinstabilities of prolate vesicles are found. For small quasi-spherical vesicles-- compared to the average channel width -- perturbation theory predicts atransition from a state with orientational oscillations of a fixed prolateshape to a state with shape oscillations of symmetrical ellipsoidal orbullet-like shapes with increasing flow velocity. Experimentally, suchorientational oscillations are observed during the slow migration of a vesicletowards the centerline of the channel. For larger vesicles, mesoscalehydrodynamics simulations and experiments show similar symmetric shapeoscillation at reduced volumes $V^* \gtrsim 0.9$. However, for non-sphericalvesicles with $V^* \lesssim 0.9$, shapes are found with two symmetric or asingle asymmetric tail.

Dynamics of Fluid Vesicles in Flow through Structured Microchannels