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We study numerically shear banded flow in planar and curved Couettegeometries. Our aim is to explain two recent observations in shear bandingsystems of roll cells stacked in the vorticity direction, associated with anundulation of the interface between the bands. Depending on the degree of cellcurvature and on the material's constitutive properties, we find either (i) aninstability of the interface between the bands driven by a jump in secondnormal stress across it; or (ii) a bulk viscoelastic Taylor Couette instabilityin the high shear band driven by a large first normal stress within it. Bothlead to roll cells and interfacial undulations, but with a different signaturein each case. Our work thereby suggests a different origin for the roll cellsin each of the recent experiments.

Viscoelastic Taylor-Couette instability of shear banded flow