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In the present study, we investigated flow structures and properties ofelastic turbulence in straight 2D channel viscoelastic fluid flow and testedearlier observations. We discovered self-organized cycling process of weaklyunstable coherent structures (CSs) of co-existing streaks and stream-wisevortices, with the former being destroyed by Kelvin-Helmholtz-like instabilityresulting in chaotic structures. The sequence periodically repeats itselfleading to stochastically steady state. This self-sustained process (SSP)remarkably resembles one investigated theoretically and experimentally forNewtonian turbulence in straight channel flow. The unexpected new ingredient isthe observation of elastic waves, which finds to be critical for existence ofCSs and SSP generation due to energy pumping from large to smaller scalespreceding sharp power-law decay in elastic turbulence energy spectrum. Thereported finding suggests the universality of CSs in transition to turbulencevia self-organized cycling (SSP) in linearly stable plane shear flows of bothelastic and Newtonian fluids.

Universal coherent structures of elastic turbulence in straight channel with viscoelastic fluid flow