Critical-layer structures and mechanisms in elastoinertial turbulence
arXiv:1811.00524 · doi:10.1103/PhysRevLett.122.124503
Abstract
Simulations of elastoinertial turbulence (EIT) of a polymer solution at low Reynolds number are shown to display localized polymer stretch fluctuations. These are very similar to structures arising from linear stability (Tollmien-Schlichting (TS) modes) and resolvent analyses: i.e., critical-layer structures localized where the mean fluid velocity equals the wavespeed. Computation of self-sustained nonlinear TS waves reveals that the critical layer exhibits stagnation points that generate sheets of large polymer stretch. These kinematics may be the genesis of similar structures in EIT.
5 pages, 4 figures; Accepted in Physical Review Letters
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