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. https://resolver.caltech.edu/CaltechAUTHORS:20190329-083647606
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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.
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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. | ||||||||||||
Group: | GALCIT | ||||||||||||
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Issue or Number: | 12 | ||||||||||||
DOI: | 10.1103/physrevlett.122.124503 | ||||||||||||
Record Number: | CaltechAUTHORS:20190329-083647606 | ||||||||||||
Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20190329-083647606 | ||||||||||||
Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||||||||
ID Code: | 94284 | ||||||||||||
Collection: | CaltechAUTHORS | ||||||||||||
Deposited By: | George Porter | ||||||||||||
Deposited On: | 29 Mar 2019 16:59 | ||||||||||||
Last Modified: | 16 Nov 2021 17:04 |
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