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Published March 29, 2019 | Published + Accepted Version
Journal Article Open

Critical-Layer Structures and Mechanisms in Elastoinertial Turbulence

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 modes) and resolvent analyses, i.e., critical-layer structures localized where the mean fluid velocity equals the wave speed. Computations of self-sustained nonlinear Tollmien-Schlichting waves reveal 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.

Additional Information

© 2019 American Physical Society. (Received 5 November 2018; published 29 March 2019) This work was supported by (UW) NSF Grant No. CBET-1510291, AFOSR Grants No. FA9550-15-1-0062 and No. FA9550-18-1-0174, and ONR Grants No. N00014-18-1-2865 and (Caltech) No. N00014-17-1-3022. A. S. and R. M. M. contributed equally to this work.

Attached Files

Published - PhysRevLett.122.124503.pdf

Accepted Version - 1811.00524.pdf

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August 19, 2023
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