Effects of anisotropic diffusion on onset of rotating magnetoconvection in plane layer; stationary modes
| Autor: | Tomáš Šoltis, Jozef Brestenský, Enrico Filippi |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Condensed matter physics Anisotropic diffusion Isotropy Computational Mechanics Astronomy and Astrophysics 010502 geochemistry & geophysics Thermal diffusivity 01 natural sciences Outer core Viscosity Geophysics Geochemistry and Petrology Mechanics of Materials 0103 physical sciences Dynamo theory Magnetic diffusivity Anisotropy 010303 astronomy & astrophysics 0105 earth and related environmental sciences |
| Zdroj: | Geophysical & Astrophysical Fluid Dynamics. 113:80-106 |
| ISSN: | 1029-0419 0309-1929 |
| DOI: | 10.1080/03091929.2019.1571585 |
| Popis: | Turbulence in the Earth's outer core not only increases all diffusive coefficients, but it can lead to their anisotropic properties. Therefore, the model of rotating magnetoconvection in horizontal plane layer rotating about vertical axis and permeated by homogeneous horizontal magnetic field, influenced by anisotropic diffusivities, viscosity and thermal diffusivity, is advanced by considering the magnetic diffusivity as anisotropic too. The case of full anisotropy, i.e. all coefficients anisotropic, is compared with both the case possessing isotropic diffusion coefficients and the case of partial anisotropy, i.e. mixed case with isotropic and anisotropic diffusive coefficients (viscosity and thermal diffusivity anisotropic and magnetic diffusivity isotropic). The existence and preference of instabilities is sensitive to all non-dimensional parameters, as well as on anisotropic parameter, the ratio of horizontal and vertical diffusivities. Two types of anisotropy, BM (introduced by Braginsky and ... |
| Databáze: | OpenAIRE |
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