ExoCubed: A Riemann-Solver Based Cubed-Sphere Dynamic Core For Planetary Atmospheres
The computational fluid dynamics on a sphere is relevant to global simulations of geophysical fluid dynamics. Using the conventional spherical-polar (or lat-lon) grid results in a singularity at the poles, with orders of magnitude smaller cell sizes at the poles in comparison to the equator. To address this problem, we developed a general circulation model (dynamic core) with a gnomonic equiangular cubed-sphere configuration.
This model is developed based on the Simulating Nonhydrostatic Atmospheres on Planets (SNAP) model, using a finite volume numerical scheme with a Riemann-solver-based dynamic core and the vertical implicit correction (VIC) scheme. This change of the horizontal configuration gives a 20-time acceleration of global simulations compared to the lat-lon grid with a similar number of cells at medium resolution.
We presented standard tests ranging from 2D shallow-water models to 3D general circulation tests, including earth-like planets and shallow hot Jupiters, to validate the accuracy of the model. The method described in this article is generic to transform any existing finite-volume hydrodynamic model in the Cartesian geometry to the spherical geometry.
Sihe Chen, Cheng Li
Subjects: Earth and Planetary Astrophysics (astro-ph.EP); Instrumentation and Methods for Astrophysics (astro-ph.IM); Atmospheric and Oceanic Physics (physics.ao-ph)
Cite as: arXiv:2403.06844 [astro-ph.EP] (or arXiv:2403.06844v1 [astro-ph.EP] for this version)
Submission history
From: Sihe Chen
[v1] Mon, 11 Mar 2024 16:03:35 UTC (14,210 KB)
https://arxiv.org/abs/2403.06844
Astrobiology, Astrochemistry,
