[Users] Problem with CarpetRegrid2/AMR

[Erik Schnetter]

Hal

This may mean that level_mask does not have storage at all times.
CarpetRegrid2 does not allocate storage for this variable -- maybe it
should, when CarpetRegrid2::adaptive_refinement is set to yes?

-erik

On Wed, Dec 14, 2011 at 4:07 PM, Hal Finkel <hfinkel at anl.gov> wrote:

> On Thu, 2011-12-08 at 22:38 +0100, Eloisa Bentivegna wrote:
> > Hello,
> >
> > I'd like to revive a discussion that went over the list a few months
> ago, regarding Carpet's AMR capability.
> >
> > I understand that the refinement has to be triggered through the
> level_mask grid function. The example that Hal gave is below.
> >
> > On Aug 30, 2011, at 9:37 PM, Hal Finkel wrote:
> >
> > > lvlmskSet =
> > > {
> > >        Name -> "SFBubble_SetLevelMask",
> > >        Schedule -> {"AT preregrid"},
> > >        Where -> Interior,
> > >        Shorthands -> { adchix, adchiy, adchiz },
> > >        Equations ->
> > >        {
> > >                adchix -> fabs[dx PD[chi,1]],
> > >                adchiy -> fabs[dy PD[chi,2]],
> > >                adchiz -> fabs[dz PD[chi,3]],
> > >
> > >                "level_mask" -> (
> > >                        Max[
> > >                                adchix, adchiy, adchiz
> > >                        ]/dchimax
> > >                ) /. Max[a_, b_, c_] -> fmax[a, fmax[b, c]]
> > >        }
> > > };
>
> FWIW, it looks like some time over the last few months this stopped
> working: setting level_mask in this way does not lead to regridding
> (even if it is > n in some places), and outputting the result using
> CarpetIOScalar has an odd result:
>
> carpetregrid2::level_mask.maximum.asc starts with:
> 0 0 -1.79769313486232e+308
> 1 1 1.30685299729774
> 2 2 1.31094960089828
> ...
>
> carpetregrid2::level_mask.minimum.asc starts with:
> 0 0 1.79769313486232e+308
> 1 1 0
> 2 2 0
> ...
>
> carpetregrid2::level_mask.average.asc has:
> 0 0 -nan
> 1 1 -nan
> 2 2 -nan
> ...
>
> What is going on here?
>
> It might also be worth noting, that to get level_mask to work with Kranc
> in the above example, I added the following after the call to
> CreateKrancThornTT:
>
> Module[{fp = OpenAppend[dirname <> "/schedule.ccl"]},
>        WriteString[fp, "\[NewLine]" <> "STORAGE:
> CarpetRegrid2::level_mask"];
>        Close[fp]
> ];
>
>  -Hal
>
> >
> > My questions are:
> >
> > 1) Is preregrid the right location to set this function?
> > 2) Does this suffice? I assume that once regridding is triggered, the
> new levels will have to be populated (via interpolation?). Is level_mask
> treated like all other grid functions?
> > 3) In the case above, the loop only goes over interior points, since the
> mask is set to be the derivative of a grid function. This implies that a
> sync is necessary before the mask can be used for regridding. Is the user
> thorn a good place to request this?
> >
> > Thanks,
> > Eloisa
>
> --
> Hal Finkel
> Postdoctoral Appointee
> Leadership Computing Facility
> Argonne National Laboratory
>
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>



-- 
Erik Schnetter <schnetter at cct.lsu.edu>   http://www.cct.lsu.edu/~eschnett/
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