THOR

"We have designed and developed, from scratch, a global circulation model named THOR that solves the three-dimensional non-hydrostatic Euler equations. Our general approach lifts the commonly used assumptions of a shallow atmosphere and hydrostatic equilibrium. We solve the "pole problem" (where converging meridians on a sphere lead to increasingly smaller time steps near the poles) by implementing an icosahedral grid. Irregularities in the grid, which lead to grid imprinting, are smoothed using the "spring dynamics" technique. We validate our implementation of spring dynamics by examining calculations of the divergence and gradient of test functions. To prevent the computational time step from being bottlenecked by having to resolve sound waves, we implement a split-explicit method together with a horizontally explicit and vertically implicit integration. We validate our global circulation model by reproducing the Earth and also the hot Jupiter-like benchmark tests. THOR was designed to run on Graphics Processing Units (GPUs), which allows for physics modules (radiative transfer, clouds, chemistry) to be added in the future, and is part of the open-source Exoclimes Simulation Platform."

https://github.com/exoclime/THOR

THOR: A New and Flexible Global Circulation Model to Explore Planetary Atmospheres - http://hgpu.org/?p=16280

Exoclimes Simulation Platform - http://www.exoclime.net/

The Exoclimes Simulation Platform (ESP) was born from a necessity to move beyond Earth-centric approaches to understanding atmospheres. Our dream and vision is to provide the exoplanet community with an open-source, freely-available, ultra-fast and cutting-edge set of simulational tools for studying exoplanetary atmospheres. The ESP harnesses the power of GPUs (graphic processing units), found in most Macs nowadays, to produce speed-ups at the order-of-magnitude level. These speed-ups are invested in building intuition and studying how atmospheric dynamics, chemistry and radiation interact in various ways.

HELIOS - GPU-Accelerated Radiative Transfer Code For Exoplanetary Atmospheres - https://github.com/exoclime/HELIOS

VULCAN - Atmospheric Chemistry - https://github.com/exoclime/VULCAN