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An experimental and computational investigation of the internal flow ofelastoviscoplastic fluids over non-smooth topologies is presented in twocomplimentary studies. In the first study, we visualize the creeping flow of aCarbopol gel over a cavity embedded in a thin slot using Optical CoherenceTomography (OCT) and confocal microscopy. We measure the size and shape of theplug as a function of Bingham and Weissenberg numbers. An asymmetry in the plugshape is observed which is also evident in our second study -- numericalsimulations using adaptive finite element method based upon an augmentedLagrangian scheme. We quantify the asymmetry and present the results as afunction of the product of the Weissenberg and Bingham numbers which collapseonto a single curve for each of these geometries. These findings underscore thetheoretical underpinnings of the synergy between elasticity and plasticity ofthese complex fluids.

Atypical plug formation in internal elastoviscoplastic fluid flows over a non-smooth topology