Solitary coherent structures in viscoelastic shear flow: computation and mechanism

Details Solitary coherent structures in viscoelastic shear flow: computation and mechanism Solitary coherent structures in viscoelastic shear flow: computation and mechanism

2000-05-26

arxiv.org/abs/physics/0005075v1

Physics

Fluid Dynamics

5 pages text and 4 figures. Submitted to Physical Review Letters

Scientific paper

10.1103/PhysRevLett.85.4056

Starting from stationary bifurcations in Couette-Dean flow, we compute nontrivial stationary solutions in inertialess viscoelastic circular Couette flow. These solutions are strongly localized vortex pairs, exist at arbitrarily large wavelengths, and show hysteresis in the Weissenberg number, similar to experimentally observed ``diwhirl'' patterns. Based on the computed velocity and stress fields, we elucidate a heuristic, fully nonlinear mechanism for these flows. We propose that these localized, fully nonlinear structures comprise fundamental building blocks for complex spatiotemporal dynamics in the flow of elastic liquids.

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