Excitation and resonant enhancement of axisymmetric internal wave modes
Name
PhysRevFluids.4.034802.pdf
Size
1.37 MB
Format
Adobe PDF
Checksum (MD5)
d721d4d6e45cd4b9db8f994ae9c6c7e3
Author(s)
Boury, S.
Odier, P.
Peacock, Thomas
Date Issued
March 2019
Journal
Physical Review Fluids
Publisher
American Physical Society
Citation
Peacock, Thomas et al. "Excitation and resonant enhancement of axisymmetric internal wave modes." Physical Review Fluids 4, 3 (March 2019): 034802 © The Author(s)
Version
Final published version
Abstract
To date, axisymmetric internal wave fields, which have relevance to atmospheric internal wave fields generated by storm cells and oceanic near-inertial wave fields produced by surface perturbations, have been experimentally realized using an oscillating sphere or torus as the source. Here we use a wave generator configuration capable of exciting axisymmetric internal wave fields of arbitrary radial form to generate axisymmetric internal wave modes. After establishing the theoretical background for axisymmetric mode propagation, taking into account lateral and vertical confinement, and also accounting for the effects of weak viscosity, we study modes of different order. We characterize the efficiency of the wave generator through careful measurement of the wave amplitude based upon group velocity arguments, and then consider the effect of vertical confinement to induce resonance, identifying a series of experimental resonant peaks that agree well with theoretical predictions. In the vicinity of resonance, the wave fields undergo a transition to nonlinear behavior that is initiated on the central axis of the domain and proceeds to erode the wave field throughout the domain.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevFluids.4.034802
