AM05-13-021 準地衡風点渦、Wire渦、楕円体渦モデルの統計的性質(大気・海洋の流れ5,一般講演)

概要

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Refinements on the quasi-geostrophic ellipsoidal moment model are proposed. Each coherent vortex is modeled by an ellipsoid of unform potential vorticity. The dynamics of N ellipsoidal vortices is a canonical Hamiltonian system of 3N degrees of freedom. We introduce a new set of canonical variables in addition to those used in the refined wire-vortex model with 2N degrees of freedom. We adapt the Gaussian integration method in the evaluation of the mutual energy integrals, instead of the moment approximation used in the previous ellipsoidal moment model. The refined model is robust and it captures the interaction of two tall vortices well, even if they are located very close each other. The refined ellipsoidal model can predict the behavior of fatter vortices more accurately than the refined wire-vorex (spheroidal) model.
日本流体力学会の論文
2005-09-05