The 0.4 version of GCM for Mac was available to download on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. This free software for Mac OS X is an intellectual property of M3 Research.
According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. GCM for Mac belongs to Education Tools. You can execute this free application on Mac OS X 10.8.3 or later. The most popular version among GCM for Mac users is 1.1.
From the developer:
Idealized 1- and 2-layer general circulation models of planetary atmospheres, and a stellar tachocline, on a sphere, solved by a variety of methods. Results can be compared to those obtained by direct numerical simulation (DNS) performed either on a spherical geodesic grid, or using a pure spectral (not pseudospectral) algorithm.
You may want to check out more Mac applications, such as UH VPN, which might be similar to GCM.
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