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New direction in elastic instability and turbulence in straight channel viscoelastic flow

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TURW04 - Wall-bounded turbulence: beyond current boundaries

After a short introduction into polymer solution hydrodynamics, I shortly describe the main results on elastically driven instabilities and elastic turbulence in flow geometries with curvilinear streamlines, about the prediction of elastic waves and absence of such waves in these flows. Then I switch to the main subject of the talk, namely recent development in parallel shear flows of polymer solutions proved to be linearly stable for the last about 50 years. We discovered in a straight channel flow elastically driven instability, elastic turbulence, elastic waves, drag reduction, and re-laminarization. In this regard, I discuss shortly normal versus non-normal bifurcations in such flows.

This talk is part of the Isaac Newton Institute Seminar Series series.

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