Froude number dependence of gravity wave radiation from unsteady rotational flow in f-plane shallow water system

Norihiko Sugimoto, Keiichi Ishioka, Shigeo Yoden

Research output: Contribution to journalArticle

3 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)299-304
Number of pages6
JournalTheoretical and Applied Mechanics Japan
Volume54
Publication statusPublished - 2005
Externally publishedYes

Fingerprint

rotational flow
Rotational flow
Earth rotation
Froude number
Gravity Waves
Gravity waves
Shallow Water
shallow water
gravity waves
electromagnetic radiation
Power Law
Earth (planet)
Radiation
Aeroacoustics
acoustics
Dissipative Systems
Breakdown
Water
breakdown
Acoustics

ASJC Scopus subject areas

  • Mechanics of Materials

Cite this

Froude number dependence of gravity wave radiation from unsteady rotational flow in f-plane shallow water system. / Sugimoto, Norihiko; Ishioka, Keiichi; Yoden, Shigeo.

In: Theoretical and Applied Mechanics Japan, Vol. 54, 2005, p. 299-304.

Research output: Contribution to journalArticle

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