Nonlinear diffusive instabilities in differentially rotating stars
作者:
E. Knobloch,
期刊:
Geophysical & Astrophysical Fluid Dynamics
(Taylor Available online 1982)
卷期:
Volume 22,
issue 1-2
页码: 133-158
ISSN:0309-1929
年代: 1982
DOI:10.1080/03091928208221740
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Angular momentum driven instabilities in a stratified differentially rotating star are investigated. In the strong buoyancy limit axisymmetric instabilities of the Goldreich-Schubert type are the most important. A detailed discussion of the linear and small amplitude theories at an arbitrary latitude is given. The bifurcation to finite amplitude steady modes is typically transcritical, and occurs whenever the angular momentum or its gradient is neither parallel not perpendicular to local gravity. Such misalignments enhance the time scale for transport of angular momentum by the Goldreich-Schubert instability. Depending on the turbulent viscosity produced by secondary shear instabilities time scales as short as the Kelvin-Helmholtz time scale are possible.
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