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Experimental generation of axisymmetric internal wave super-harmonics
Name
PhysRevFluids.6.064801.pdf
Description
Published version
Size
1.65 MB
Format
Adobe PDF
Checksum (MD5)
84060fb98dbb5b13b3b55a195bbf5f33
Author(s)
Boury, S
Peacock, T
Odier, P
Date Issued
2021
Journal
Physical Review Fluids
Publisher
American Physical Society (APS)
Citation
Boury, S, Peacock, T and Odier, P. 2021. "Experimental generation of axisymmetric internal wave super-harmonics." Physical Review Fluids, 6 (6).
Version
Final published version
Abstract
In this paper, we present an experimental study of weakly nonlinear interaction of
axisymmetric internal gravity waves in a resonant cavity, supported by theoretical considerations. Contrary to plane waves in Cartesian coordinates, for which self-interacting
terms are null in a linear stratification, the nonlinear self-interaction of an internal wave
mode in axisymmetric geometry is found to be efficient at producing super-harmonics,
i.e., waves whose frequencies are integer multiples of the excitation frequency. Due to the
range of frequencies tested in our experiments, the first harmonic frequency is below the
cutoff imposed by the stratification so the lowest harmonic created can always propagate.
The study shows that the super-harmonic wave field is a sum of standing waves satisfying
both the dispersion relation for internal waves and the boundary conditions imposed by the
cavity walls, while conserving the axisymmetry
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DOI of Published Version
10.1103/PHYSREVFLUIDS.6.064801
