---
_id: '10299'
abstract:
- lang: eng
  text: Turbulence generally arises in shear flows if velocities and hence, inertial
    forces are sufficiently large. In striking contrast, viscoelastic fluids can exhibit
    disordered motion even at vanishing inertia. Intermediate between these cases,
    a state of chaotic motion, “elastoinertial turbulence” (EIT), has been observed
    in a narrow Reynolds number interval. We here determine the origin of EIT in experiments
    and show that characteristic EIT structures can be detected across an unexpectedly
    wide range of parameters. Close to onset, a pattern of chevron-shaped streaks
    emerges in qualitative agreement with linear and weakly nonlinear theory. However,
    in experiments, the dynamics remain weakly chaotic, and the instability can be
    traced to far lower Reynolds numbers than permitted by theory. For increasing
    inertia, the flow undergoes a transformation to a wall mode composed of inclined
    near-wall streaks and shear layers. This mode persists to what is known as the
    “maximum drag reduction limit,” and overall EIT is found to dominate viscoelastic
    flows across more than three orders of magnitude in Reynolds number.
acknowledgement: We thank Y. Dubief, R. Kerswell, E. Marensi, V. Shankar, V. Steinberg,
  and V. Terrapon for discussions and helpful comments. A.V. and B.H. acknowledge
  funding from the Austrian Science Fund, grant I4188-N30, within the Deutsche Forschungsgemeinschaft
  research unit FOR 2688.
article_number: e2102350118
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: George H
  full_name: Choueiri, George H
  id: 448BD5BC-F248-11E8-B48F-1D18A9856A87
  last_name: Choueiri
- first_name: Jose M
  full_name: Lopez Alonso, Jose M
  id: 40770848-F248-11E8-B48F-1D18A9856A87
  last_name: Lopez Alonso
  orcid: 0000-0002-0384-2022
- first_name: Atul
  full_name: Varshney, Atul
  id: 2A2006B2-F248-11E8-B48F-1D18A9856A87
  last_name: Varshney
  orcid: 0000-0002-3072-5999
- first_name: Sarath
  full_name: Sankar, Sarath
  last_name: Sankar
- first_name: Björn
  full_name: Hof, Björn
  id: 3A374330-F248-11E8-B48F-1D18A9856A87
  last_name: Hof
  orcid: 0000-0003-2057-2754
citation:
  ama: Choueiri GH, Lopez Alonso JM, Varshney A, Sankar S, Hof B. Experimental observation
    of the origin and structure of elastoinertial turbulence. <i>Proceedings of the
    National Academy of Sciences of the United States of America</i>. 2021;118(45).
    doi:<a href="https://doi.org/10.1073/pnas.2102350118">10.1073/pnas.2102350118</a>
  apa: Choueiri, G. H., Lopez Alonso, J. M., Varshney, A., Sankar, S., &#38; Hof,
    B. (2021). Experimental observation of the origin and structure of elastoinertial
    turbulence. <i>Proceedings of the National Academy of Sciences of the United States
    of America</i>. National Academy of Sciences. <a href="https://doi.org/10.1073/pnas.2102350118">https://doi.org/10.1073/pnas.2102350118</a>
  chicago: Choueiri, George H, Jose M Lopez Alonso, Atul Varshney, Sarath Sankar,
    and Björn Hof. “Experimental Observation of the Origin and Structure of Elastoinertial
    Turbulence.” <i>Proceedings of the National Academy of Sciences of the United
    States of America</i>. National Academy of Sciences, 2021. <a href="https://doi.org/10.1073/pnas.2102350118">https://doi.org/10.1073/pnas.2102350118</a>.
  ieee: G. H. Choueiri, J. M. Lopez Alonso, A. Varshney, S. Sankar, and B. Hof, “Experimental
    observation of the origin and structure of elastoinertial turbulence,” <i>Proceedings
    of the National Academy of Sciences of the United States of America</i>, vol.
    118, no. 45. National Academy of Sciences, 2021.
  ista: Choueiri GH, Lopez Alonso JM, Varshney A, Sankar S, Hof B. 2021. Experimental
    observation of the origin and structure of elastoinertial turbulence. Proceedings
    of the National Academy of Sciences of the United States of America. 118(45),
    e2102350118.
  mla: Choueiri, George H., et al. “Experimental Observation of the Origin and Structure
    of Elastoinertial Turbulence.” <i>Proceedings of the National Academy of Sciences
    of the United States of America</i>, vol. 118, no. 45, e2102350118, National Academy
    of Sciences, 2021, doi:<a href="https://doi.org/10.1073/pnas.2102350118">10.1073/pnas.2102350118</a>.
  short: G.H. Choueiri, J.M. Lopez Alonso, A. Varshney, S. Sankar, B. Hof, Proceedings
    of the National Academy of Sciences of the United States of America 118 (2021).
corr_author: '1'
date_created: 2021-11-17T13:24:24Z
date_published: 2021-11-03T00:00:00Z
date_updated: 2026-05-04T22:30:21Z
day: '03'
department:
- _id: BjHo
doi: 10.1073/pnas.2102350118
external_id:
  arxiv:
  - '2103.00023'
  isi:
  - '000720926900019'
  pmid:
  - ' 34732570'
intvolume: '       118'
isi: 1
issue: '45'
keyword:
- multidisciplinary
- elastoinertial turbulence
- viscoelastic flows
- elastic instability
- drag reduction
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://arxiv.org/abs/2103.00023
month: '11'
oa: 1
oa_version: Preprint
pmid: 1
project:
- _id: 238B8092-32DE-11EA-91FC-C7463DDC885E
  call_identifier: FWF
  grant_number: I04188
  name: Instabilities in pulsating pipe flow in complex fluids
publication: Proceedings of the National Academy of Sciences of the United States
  of America
publication_identifier:
  eissn:
  - 1091-6490
  issn:
  - 0027-8424
publication_status: published
publisher: National Academy of Sciences
quality_controlled: '1'
related_material:
  record:
  - id: '19906'
    relation: dissertation_contains
    status: public
scopus_import: '1'
status: public
title: Experimental observation of the origin and structure of elastoinertial turbulence
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 118
year: '2021'
...