Antisymmetric Polar Modes of Thermal Convection in Rotating Spherical Fluid Shells at High Taylor Numbers

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Antisymmetric polar modes of thermal convection in rotating spherical fluid shells at high taylor numbers.

The onset of thermal convection in a rotating spherical shell of intermediate radius ratio eta=0.4 is studied numerically for Taylor numbers Ta > or = 10(11) and the Prandtl number of the liquid sodium (sigma=0.01). For the first time, it is shown that at very high Taylor numbers the first unstable mode can be antisymmetric with respect to the equator and confined inside a cylinder tangent to t...

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A numerical study of the onset of convection in rotating, internally heated, selfgravitating fluid spheres is presented. The exploration of the stability of the conduction state versus the Taylor and the Prandtl numbers supplies a detailed idea of the laws that fulfil the four types of solutions obtained at low Prandtl numbers. The main result found is that axisymmetric (torsional) modes of con...

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ژورنال

عنوان ژورنال: Physical Review Letters

سال: 2008

ISSN: 0031-9007,1079-7114

DOI: 10.1103/physrevlett.101.194501