### 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 language | English |
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Pages (from-to) | 299-304 |

Number of pages | 6 |

Journal | Theoretical and Applied Mechanics Japan |

Volume | 54 |

Publication status | Published - 2005 |

Externally published | Yes |

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### ASJC Scopus subject areas

- Mechanics of Materials

### Cite this

*Theoretical and Applied Mechanics Japan*,

*54*, 299-304.

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

Research output: Contribution to journal › Article

*Theoretical and Applied Mechanics Japan*, vol. 54, pp. 299-304.

}

TY - JOUR

T1 - Froude number dependence of gravity wave radiation from unsteady rotational flow in f-plane shallow water system

AU - Sugimoto, Norihiko

AU - Ishioka, Keiichi

AU - Yoden, Shigeo

PY - 2005

Y1 - 2005

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=33646712153&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33646712153&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:33646712153

VL - 54

SP - 299

EP - 304

JO - Theoretical and Applied Mechanics

JF - Theoretical and Applied Mechanics

SN - 1348-0693

ER -