---
res:
bibo_abstract:
- We investigate the local self-sustained process underlying spiral turbulence in
counter-rotating Taylor–Couette flow using a periodic annular domain, shaped as
a parallelogram, two of whose sides are aligned with the cylindrical helix described
by the spiral pattern. The primary focus of the study is placed on the emergence
of drifting–rotating waves (DRW) that capture, in a relatively small domain, the
main features of coherent structures typically observed in developed turbulence.
The transitional dynamics of the subcritical region, far below the first instability
of the laminar circular Couette flow, is determined by the upper and lower branches
of DRW solutions originated at saddle-node bifurcations. The mechanism whereby
these solutions self-sustain, and the chaotic dynamics they induce, are conspicuously
reminiscent of other subcritical shear flows. Remarkably, the flow properties
of DRW persist even as the Reynolds number is increased beyond the linear stability
threshold of the base flow. Simulations in a narrow parallelogram domain stretched
in the azimuthal direction to revolve around the apparatus a full turn confirm
that self-sustained vortices eventually concentrate into a localised pattern.
The resulting statistical steady state satisfactorily reproduces qualitatively,
and to a certain degree also quantitatively, the topology and properties of spiral
turbulence as calculated in a large periodic domain of sufficient aspect ratio
that is representative of the real system.@eng
bibo_authorlist:
- foaf_Person:
foaf_givenName: B.
foaf_name: Wang, B.
foaf_surname: Wang
- foaf_Person:
foaf_givenName: Roger
foaf_name: Ayats López, Roger
foaf_surname: Ayats López
foaf_workInfoHomepage: http://www.librecat.org/personId=ab77522d-073b-11ed-8aff-e71b39258362
orcid: 0000-0001-6572-0621
- foaf_Person:
foaf_givenName: K.
foaf_name: Deguchi, K.
foaf_surname: Deguchi
- foaf_Person:
foaf_givenName: F.
foaf_name: Mellibovsky, F.
foaf_surname: Mellibovsky
- foaf_Person:
foaf_givenName: A.
foaf_name: Meseguer, A.
foaf_surname: Meseguer
bibo_doi: 10.1017/jfm.2022.828
bibo_volume: 951
dct_date: 2022^xs_gYear
dct_identifier:
- UT:000879446900001
dct_isPartOf:
- http://id.crossref.org/issn/0022-1120
- http://id.crossref.org/issn/1469-7645
dct_language: eng
dct_publisher: Cambridge University Press@
dct_subject:
- Mechanical Engineering
- Mechanics of Materials
- Condensed Matter Physics
- Applied Mathematics
dct_title: Self-sustainment of coherent structures in counter-rotating Taylor–Couette
flow@
...