Self-sustained elastoinertial Tollmien–Schlichting waves

Abstract

Direct simulations of two-dimensional plane channel flow of a viscoelastic fluid at Reynolds number at which the nonlinear solution family comes into existence is just above this transition. Finally, evidence indicates that this branch is connected through an unstable solution branch to two-dimensional elastoinertial turbulence (EIT). These results suggest that, in the parameter range considered here, the bypass transition leading to EIT is mediated by nonlinear amplification and self-sustenance of perturbations that excite the TS mode.

Topics & Concepts