期刊
GEOPHYSICAL AND ASTROPHYSICAL FLUID DYNAMICS
卷 107, 期 1-2, 页码 218-243出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/03091929.2012.672567
关键词
Anelastic convection; Convective dynamo; Compressibility
资金
- STFC at the University of Leeds
- Polish Ministry of Science and Higher Education [IP2011 03667]
- Science and Technology Facilities Council [ST/H008802/1, ST/H008799/1, ST/H002332/1] Funding Source: researchfish
- STFC [ST/H008802/1, ST/H008799/1, ST/H002332/1] Funding Source: UKRI
We study the effect of stratification on large-scale dynamo action in convecting fluids in the presence of background rotation. The fluid is confined between two horizontal planes and both boundaries are impermeable, stress-free and perfectly conducting. An asymptotic analysis is performed in the limit of rapid rotation (>> 1 where is the Taylor number). We analyse asymptotic magnetic dynamo solutions in rapidly rotating systems generalising the results of Soward [A convection-driven dynamo I. The weak field case. Philos. Trans. R. Soc. Lond. A 1974, 275, 611651] to include the effects of compressibility. We find that in general the presence of stratification delays the efficiency of large-scale dynamo action in this regime, leading to a reduction of the onset of dynamo action and in the nonlinear regime a diminution of the large-scale magnetic energy for flows with the same kinetic energy.
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