Theoretical and Applied Mechanics Japan
Online ISSN : 1349-4244
Print ISSN : 1348-0693
ISSN-L : 1348-0693
III. HEAT TRANSFER AND FLUID DYNAMICS
Froude Number Dependence of Gravity Wave Radiation from Unsteady Rotational Flow in f-plane Shallow Water System
Norihiko SUGIMOTOKeiichi ISHIOKAShigeo YODEN
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2005 Volume 54 Pages 299-304

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Abstract

Continuous gravity wave radiation from unsteady rotational flow is investigated numerically in f-plane shallow water system for a wide range of Rossby number, Ro, and Froude number, Fr, using forced dissipative system. For large Ro, where the effect of the earth rotation is negligible, gravity wave flux is proportional to Fr, which is consistent with the aero-acoustic sound radiation theory (the Lighthill theory). However, this power law is not valid for relatively small Ro, where the effect of the earth rotation is important. The mechanism for the breakdown of the power law is also examined using temporal spectral analyses.

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© 2005 by National Committee for IUTAM
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