[Users] running ML_ADMConstraints with timelevels=1 and no SYNCs

[Roland Haas]

Hello Erik, Frank, all,

yes, I would only compute and output the constraints on the coarse
level timestep.

> The largest issue I see is that e.g. a regular L2 norm over the simulation
> domain is not very useful. It emphasizes very much the coarse grid, which
> is very large, and where the boundary conditions might do strange things to
> the constraints. Similarly, you will need to be careful to exclude the
> interior of the horizons (see CarpetMask) to avoid looking near the
> punctures. CarpetMask is not smooth in time, so looking at the time
> evolution of the constraint norm is then also problematic.
CarpetMask is active and set up (Ian had thankfully already pointed
this out).

> You might be more happy if you look e.g. at the "isum" or "inorm2" output.
> This output is not weighted by coordinate volume, but by grid cells, so
> that the coarse grid is deemphasized.
Ok, I will add isum and inorm2 to the output.Currently I had norm_inf,
norm1 and norm2. Really these are only intended to check for obvious
errors in the parameter file the make the contraints grow.

Yours,
Roland

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