2D Rayleigh-Taylor Instability

Problem Background

For background and problem setup see ​http://www.astro.virginia.edu/VITA/ATHENA/rt.html

This page has information on both 2D and 3D simulations, Hydro and MHD, but the 2D Hydro case is the relevant one here.

Reason for Test

This test is run in order to verify that uniform gravity is working correctly.

Results

The reference chombo frame was verified by comparing the instability growth rate to the analytic growth rate. For more details on this simulation see Rayleigh-Taylor Page

Reference Chombo	New Chombo
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