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arXiv · 2004.06290

A global nonhydrostatic dynamical core on cubed sphere using multi-moment finite volume method: formulation and preliminary test

Chungang Chen·Xingliang Li·Feng Xiao·Xueshun Shen
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Abstract

A nonhydrostatic dynamical core has been developed by using the multi-moment finite volume method that ensures the rigorous numerical conservation. To represent the spherical geometry free of polar problems, the cubed-sphere grid is adopted. A fourth-order multi-moment discretization formulation is applied to the nonhydrostatic governing equations cast in local curvilinear coordinates on each patch of cubed sphere through a gnomonic projection. In vertical direction, the height-based terrain-following grid is used to represent the topography. To get around the CFL stability restriction imposed by relatively small grid spacing in the vertical direction, the dimensional-splitting time integration using the HEVI (Horizontal Explicit and Vertical Implicit) strategy is implemented by applying the IMEX Runge-Kutta scheme. The proposed dynamical core preserves the fourth-order accuracy in spherical geometry and has been verified by the widely-used benchmark tests. The results of our numerical experiments show that the present numerical core has superior solution quality and great practical potential as a platform for atmospheric models. A new unified model for numerical weather prediction and global atmospheric circulation simulation based on this dynamical core is under development.

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physics.ao-phphysics.comp-phphysics.flu-dyn

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BibTeXRIS

Chungang Chen, Xingliang Li, Feng Xiao, Xueshun Shen. 2020-04-14. A global nonhydrostatic dynamical core on cubed sphere using multi-moment finite volume method: formulation and preliminary test. https://arxiv.org/abs/2004.06290

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