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Title: Influence of the multipole order of the source on the decay of an inertial wave beam in a rotating fluid

Abstract

We analyze theoretically and experimentally the far-field viscous decay of a two-dimensional inertial wave beam emitted by a harmonic line source in a rotating fluid. By identifying the relevant conserved quantities along the wave beam, we show how the beam structure and decay exponent are governed by the multipole order of the source. Two wavemakers are considered experimentally, a pulsating and an oscillating cylinder, aiming to produce a monopole and a dipole source, respectively. The relevant conserved quantity which discriminates between these two sources is the instantaneous flow rate along the wave beam, which is non-zero for the monopole and zero for the dipole. For each source, the beam structure and decay exponent, measured using particle image velocimetry, are in good agreement with the predictions.

Authors:
; ;  [1];  [2]
  1. Laboratoire FAST, CNRS, Université Paris-Sud, Orsay (France)
  2. Laboratoire LEGI, CNRS, Université Grenoble Alpes, Grenoble (France)
Publication Date:
OSTI Identifier:
22483226
Resource Type:
Journal Article
Journal Name:
Physics of Fluids (1994)
Additional Journal Information:
Journal Volume: 27; Journal Issue: 6; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-6631
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CYLINDERS; DIPOLES; FLOW RATE; FLUIDS; IMAGES; PARTICLES

Citation Formats

Machicoane, Nathanaël, Cortet, Pierre-Philippe, Moisy, Frédéric, and Voisin, Bruno. Influence of the multipole order of the source on the decay of an inertial wave beam in a rotating fluid. United States: N. p., 2015. Web. doi:10.1063/1.4922735.
Machicoane, Nathanaël, Cortet, Pierre-Philippe, Moisy, Frédéric, & Voisin, Bruno. Influence of the multipole order of the source on the decay of an inertial wave beam in a rotating fluid. United States. https://doi.org/10.1063/1.4922735
Machicoane, Nathanaël, Cortet, Pierre-Philippe, Moisy, Frédéric, and Voisin, Bruno. 2015. "Influence of the multipole order of the source on the decay of an inertial wave beam in a rotating fluid". United States. https://doi.org/10.1063/1.4922735.
@article{osti_22483226,
title = {Influence of the multipole order of the source on the decay of an inertial wave beam in a rotating fluid},
author = {Machicoane, Nathanaël and Cortet, Pierre-Philippe and Moisy, Frédéric and Voisin, Bruno},
abstractNote = {We analyze theoretically and experimentally the far-field viscous decay of a two-dimensional inertial wave beam emitted by a harmonic line source in a rotating fluid. By identifying the relevant conserved quantities along the wave beam, we show how the beam structure and decay exponent are governed by the multipole order of the source. Two wavemakers are considered experimentally, a pulsating and an oscillating cylinder, aiming to produce a monopole and a dipole source, respectively. The relevant conserved quantity which discriminates between these two sources is the instantaneous flow rate along the wave beam, which is non-zero for the monopole and zero for the dipole. For each source, the beam structure and decay exponent, measured using particle image velocimetry, are in good agreement with the predictions.},
doi = {10.1063/1.4922735},
url = {https://www.osti.gov/biblio/22483226}, journal = {Physics of Fluids (1994)},
issn = {1070-6631},
number = 6,
volume = 27,
place = {United States},
year = {Mon Jun 15 00:00:00 EDT 2015},
month = {Mon Jun 15 00:00:00 EDT 2015}
}