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Critical-Layer Structures and Mechanisms in Elastoinertial Turbulence

Shekar, Ashwin and McMullen, Ryan M. and Wang, Sung-Ning and McKeon, Beverley J. and Graham, Michael D. (2019) Critical-Layer Structures and Mechanisms in Elastoinertial Turbulence. Physical Review Letters, 122 (12). Art. No. 124503. ISSN 0031-9007. doi:10.1103/physrevlett.122.124503.

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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.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
McMullen, Ryan M.0000-0003-1371-7150
McKeon, Beverley J.0000-0003-4220-1583
Graham, Michael D.0000-0003-4983-4949
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.
Funding AgencyGrant Number
Air Force Office of Scientific Research (AFOSR)FA9550-15-1-0062
Air Force Office of Scientific Research (AFOSR)FA9550-18-1-0174
Office of Naval Research (ONR)N00014-18-1-2865
Office of Naval Research (ONR)N00014-17-1-3022
Issue or Number:12
Record Number:CaltechAUTHORS:20190329-083647606
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:94284
Deposited By: George Porter
Deposited On:29 Mar 2019 16:59
Last Modified:16 Nov 2021 17:04

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