高速回転球殻中に出現する柱状螺旋状対流のロスビー波伝播性質による解釈(対流・拡散・渦・波動対流(1),一般講演)

概要

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Spiralling-columnar convection emerging in rapidly rotating spheres and spherical shells is examined through the radial propagation properties of topographic Rossby waves to obtain its physical understanding. It is shown that structure of critical convection obtained by linear stability analysis in a two-dimensional rapidly rotating annulus is formed by the propagation of Rossby waves from a region with slightly inclined boundaries to the region with strongly inclined boundaries. The appearance of a spiral structure corresponds to an increase of the local radial wavenumber of the Rossby waves propagating in the radial direction. Energy budget analyses of spiral convection both in a two-dimensional rotating annulus and in a three-dimensional rotating spherical shell show that a part of the kinetic energy generated in the region with slightly inclined boundaries is dynamically transferred and dissipates through viscosity in the region with strongly inclined boundaries, which is consistent with the geometry of Rossby wave propagation.
日本流体力学会の論文
2009-09-02