## 抄録

The linear stability of unbounded strained vortices in a stably stratified fluid is investigated theoretically. The problem is reduced to a Floquet problem which is solved numerically. The three-dimensional elliptical instability of Pierrehumbert type [Phys. Rev. Lett. 57, 2157 (1986)] is shown to be suppressed by the stable stratification and it disappears when the Brunt- Väisälä frequency exceeds unity. On the other hand, two classes of new instability mode are found to occur. One appears only when the Brunt-Väisälä frequency is less than 2, whereas the other persists for all values of the Brunt-Väisälä frequency. The former mode is related to a parametric resonance of internal gravity waves, and the latter modes are related to superharmonic parametric instability.

本文言語 | 英語 |
---|---|

ページ（範囲） | 2515-2522 |

ページ数 | 8 |

ジャーナル | Physics of Fluids A |

巻 | 4 |

号 | 11 |

DOI | |

出版ステータス | 出版済み - 1 1 1992 |

外部発表 | はい |

## All Science Journal Classification (ASJC) codes

- 工学（全般）