Co-current axisymmetric flow in complex geometries: Numerical simulation

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Abstract

We describe a finite element algorithm for computing steady-state stratified flow of two immiscible viscoelastic fluids in complex goemetries. The method is applied to the analysis of co-current axisymmetric flow of both Newtonian and Oldroyd-B fluids through an abrupt expansion or contraction. Good agreement is found between the numerical predictions and experimental data reported by Van de Griend and Denn in the companion paper preceding this one. Predictions at high elasticity levels beyond the range of the experimental data reveal important kinematical differences relative to the Newtonian case

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