[Users] Cartoon2D and Carpet

[Erik Schnetter]

Luca

This check ensures that there is one active grid point in the y direction,
and that the number of symmetry (i.e. boundary) points is the same as the
number of ghost points.

This needs to hold independent of Carpet. If CarpetRegrid2 chooses a
different domain size, then this is wrong, and you will need to correct the
parameter file.

I have just added a test file to Cartoon2D. Look in particular at the
CoordBase parameters there.

-erik


On Thu, May 28, 2015 at 3:26 AM, Luca Baiotti <
baiotti at ipc.phys.sci.osaka-u.ac.jp> wrote:

> Hello,
>
> I have a question about CactusNumerical/Cartoon2D.
>
> In the source file ApplyCartoon.c, there is a condition for the grid setup:
>
> if(cctk_gsh[1] != 2*cctk_nghostzones[1]+1)
>     {
>             CCTK_WARN(0, "Grid size in y direction inappropriate.");
>      }
>
> As far as I could tell, this is generally violated in multilevel
> Carpet (CarpetRegrid2) runs, with standard settings that determine the
> minimum extension of the refined grids, like
> Carpet::use_buffer_zones = yes
> mol::ode_method          = rk4
>
> That condition for Cartoon2D can be achieved on the coarsest level by
> setting CoordBase::ymax equal to the spacing dy and CoordBase::ymin
> equal to -dy. But it cannot be set for refined levels, because
> CarpetRegrid2 adds as many points as required for the buffer zones.
> Indeed, Carpet adds enough buffer points for its own purposes that
> Cartoon2D seems to work fine.
>
> Should the above condition be changed to
>
> if(cctk_gsh[1] >= 2*cctk_nghostzones[1]+1)
>
> ?
>
> Yours,
> Luca
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-- 
Erik Schnetter <schnetter at cct.lsu.edu>
http://www.perimeterinstitute.ca/personal/eschnetter/
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