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Elastic and Elasto-Inertial Turbulence: New Discoveries and Remaining Challenges

Yves Dubief, University of Vermont

Bamin Khomami, University of Tennessee

The strong coupling of inertial and elastic forces commonly quantified by the elasticity number, defined as the ratio of the Weissenberg (Wi) to Reynolds number (Re), i.e., E=Wi/Re leads to various flow transition routes to turbulent flow states that are specific to polymeric fluids.  Fascinating example include, the elastically dominated inertia less flow state, namely, Elastic Turbulence (ET) and elasto-inertial turbulence (EIT). While ET is essentially a spatially smooth and temporally random flow, dominated by a strong nonlinear interaction of a few large-scale spatial modes, EIT is chaotic flow state that occurs in subcritical and supercritical wall-bounded flows sustained by polymer additives. This symposium welcomes contributions on investigation of ET and EIT in a wide variety of flows, including Poiseuille, Couette, Rayleigh Benard convection, and submerged jet flows. The discussion will focus on the similarities and differences between Newtonian turbulence, ET and EIT, from the perspectives of instabilities, coherent structures, and spectral universality.