Observation of inertia-gravity wave attractors in an axisymmetric enclosed basin

Observation of inertia-gravity wave attractors in an axisymmetric enclosed basin Full article

Journal

Physical Review Fluids
ISSN: 2469-990X

Output data

Year: 2023, Volume: 8, Number: 10, Article number : 104802, Pages count : 20 DOI: 10.1103/physrevfluids.8.104802

Authors

Pacary Corentin ¹ , Dauxois Thierry ¹ , Ermanyuk Evgeny V. ² , Metz Pascal ¹ , Moulin Marc ¹ , Joubaud Sylvain ^1,3

Affiliations

1	ENS de Lyon, CNRS, Laboratoire de Physique, F-69342 Lyon, France
2	Lavrentyev Institute of Hydrodynamics, av. Lavrentyev 15, Novosibirsk 630090, Russia
3	Institut Universitaire de France (IUF), 1 rue Descartes, 75005 Paris, France

Internal waves are ubiquitous in the ocean and play an essential role in the transport of energy and mixing. Their peculiar reflection enables the concentration of energy on a limit cycle. With wave beams viewed as rays, this reflection on an inclined slope shrinks its width and generically brings closer two initially different trajectories eventually reaching a limit cycle called an attractor. Following previous studies, a ray-tracing algorithm is used to track the convergence of wave beams onto such a structure in a 3D axisymmetric domain. This information is used to design experiments using a truncated conical shaped tank in order to form an inertia-gravity waves attractor in a 3D axisymmetric geometry. By increasing the amplitude of the forcing, an evolution of the attractor characteristics can be observed. The occurrence of waves at frequencies lower than the forcing frequency ω0 suggests triadic resonant instability in a rotating or in a stratified case. Experiments performed in a stratification-only or a rotation-only case indicate two distinct behaviors. The existence of easily excited standing waves, resonant modes of the tank, at frequencies lower than the forcing one enables sharp triadic resonance instability for internal gravity waves, which is not possible for inertial waves. The effect of the symmetry axis is also investigated by adding a cylinder of sufficient diameter at the center of the domain for the wave to reflect on and thereby avoid the interaction on the singularity. Without it, the large amplitude of the waves on the axis triggers nonlinear effects and mixing, denying the access to the wave turbulence regime.

Pacary C. , Dauxois T. , Ermanyuk E.V. , Metz P. , Moulin M. , Joubaud S.
Observation of inertia-gravity wave attractors in an axisymmetric enclosed basin
Physical Review Fluids. 2023. V.8. N10. 104802 :1-20. DOI: 10.1103/physrevfluids.8.104802 WOS Scopus РИНЦ OpenAlex

Submitted:	Mar 6, 2023
Accepted:	Sep 12, 2023
Published print:	Oct 25, 2023

Web of science:	WOS:001093435100001
Scopus:	2-s2.0-85165341830
Elibrary:	61046787
OpenAlex:	W4387940424

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OpenAlex	2
Elibrary	2
Scopus	3
Web of science	2