[Users] adding inner refinement levels with Carpet

[Roland Haas]

Hello Miguel,

> i was wondering whether there is a way to add inner refinement levels with CarpetRegrid2 
> (or CarpetRegrid) as a simulation progresses.
> let's say that i have some configuration that collapses to a black hole, and i want to 
> keep resolving accurately the inner region. is there some way for me to tell CarpetRegrid 
> to add inner levels whenever a certain condition is fulfilled, ie, enough time elapses, or 
> some grid quantity (like the lapse) grows beyond a certain value?
The easiest way is likely to use the Triggers thorn (in
CactusUtils/Triggers). See
http://einsteintoolkit.org/gallery/bns/nsnstohmns.par in http://einsteintoolkit.org/gallery/bns/index.html for an example when simulating neutron stars.

Yours,
Roland

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