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.
|ジャーナル||Theoretical and Applied Mechanics Japan|
|出版ステータス||Published - 2005 12月 1|
ASJC Scopus subject areas
- 数学 (全般)