New direction and perspectives in elastic instability and turbulence in various viscoelastic flow geometries without inertia (Short Review)Victor Steinberg Weizmann Institute of Science, Rehovot, Israel Received March 5, 2022, published online April 25, 2022 Abstract We shortly describe the main results on elastically driven instabilities and elastic turbulence in viscoelastic inertialess flows with curved streamlines. Then we describe a theory of elastic turbulence and prediction of elastic waves Re << 1 and Wi >> 1, which speed depends on the elastic stress similar to the Alfven waves in magneto-hydrodynamics and in a contrast to all other, which speed depends on medium elasticity. Since the established and testified mechanism of elastic instability of viscoelastic flows with curvilinear streamlines becomes ineffective at zero curvature, so parallel shear flows are proved linearly stable, similar to Newtonian parallel shear flows. However, the linear stability of parallel shear flows does not imply their global stability. Here we switch to the main subject, namely a recent development in inertia-less parallel shear channel flow of polymer solutions. In such flow, we discover an elastically driven instability, elastic turbulence, elastic waves, and drag reduction down to relaminarization that contradict to the linear stability prediction. In this regard, we discuss shortly normal versus non-normal bifurcations in such flows, flow resistance, velocity and pressure fluctuations, and spatial and spectral velocity as function of Wi at high elasticity number. Key words: elastic instability, elastic turbulence, viscoelastic inertialess flows. |