Quick and dirty Rayleigh-Taylor instability

The Rayleigh-Taylor instability is a well-known benchmarck for CFD codes. The idea is to start with two phases, on on top of the other, the lighter one being underneath. The interface is slightly perturbed, and this plume appears. I describe a quick and dirty way of getting this instability.

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Getting rid of capitalized ribbons in office 2013

A_(capital_and_small)Do you hate capital letters? I do, since FORTRAN. Fortunately, people are learning they should not be used. Specially editors. Nevertheless, here comes office 2013 with brand new capitalized ribbons. Straight capital letters, I mean, not small caps.

Anyway, I found somewhere a trick to make sure menus stay in lower case: append a space before, or after, the ribbon name (right-click on any ribbon to change their names). This name, by the way, is correctly typed (!).