3-DIMENSIONAL INSTABILITY OF STRAINED VORTICES IN A STABLE STRATIFIED FLUID

被引：52

作者：

MIYAZAKI, T

FUKUMOTO, Y

机构：

[1] NATL INST ENVIRONM STUDIES,YATABE,IBARAKI 305,JAPAN

[2] NAGOYA UNIV,DEPT APPL PHYS,CHIKUSA KU,NAGOYA 46401,JAPAN

来源：

PHYSICS OF FLUIDS A-FLUID DYNAMICS | 1992年 / 4卷 / 11期

关键词：

D O I：

10.1063/1.858438

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

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-Vaisala frequency exceeds unity. On the other hand, two classes of new instability mode are found to occur. One appears only when the Brunt-Vaisala frequency is less than 2, whereas the other persists for all values of the Brunt-Vaisala frequency. The former mode is related to a parametric resonance of internal gravity waves, and the latter modes are related to superharmonic parametric instability.

引用

页码：2515 / 2522

页数：8

共 15 条

[11] SECONDARY INSTABILITY OF WALL-BOUNDED SHEAR FLOWS [J].