[Users] HDF5 output with cell-centered grid

[Erik Schnetter]

Vassili

By default, the symmetry boundary points are output. This often leads to
strange-looking data, as the symmetry points are just copies of interior
points. There are parameters to suppress this, e.g.

CarpetIOHDF5::output_symmetry_points (try setting this to "no")

You could also manually remove the symmetry points by clipping your image
at the symmetry plane z=0.

-erik



On Wed, Jan 16, 2013 at 7:08 AM, Vassilios Mewes <vassilios.mewes at uv.es>wrote:

> sorry for the messages before, hopefully the mail is now small enough, but
> i thought that adding a plot might explain better what i mean..
>
> Hello all,
>
> i recently read the Reisswig et al. 2012 paper and started trying to
> switch to cell-centered grid in order to be able to use the
> LSUThorns/Refluxing thorn. i am trying to simulate BH+torus systems and due
> to the size of the torus its hard to have it contained within a refinement
> level, so i thought that using a cell-centered grid in order to use
> refluxing might improve results..
>
> i however run into problems getting the hdf5 output of 3D grid frundtions
> to work...
>
> using the static_tov_cc_rf.par file from the Refluxing trunk, i get weird
> output in the mesh at the reflection boundaries (the par file uses octant
> mode)..
>
> i am using the following parameters for CarpetIOHDF5:
>
> IOHDF5::out_every              = 256
> IOHDF5::one_file_per_group     = no
> IOHDF5::output_symmetry_points = no
> IOHDF5::out3D_ghosts           = no
> IOHDF5::output_ghost_points    = no
> IOHDF5::out3D_outer_ghosts     = no
> IOHDF5::output_boundary_points = no
> IOHDF5::output_buffer_points   = no
> IOHDF5::compression_level      = 9
> IOHDF5::use_checksums          = yes
> IOHDF5::out_vars               = "
>  HydroBase::rho
>  HydroBase::press
>  HydroBase::eps
>  HydroBase::vel
>  ADMBase::lapse
>  ADMBase::metric
>  ADMBase::curv
>  GRHydro::scon
> "
>
> the simulations seems to work fine, so is the carpetiohdf5 thorn not
> suitable for cell-centered output? another effect (that might be output
> related) is that the different refinement levels are shifted (i'll attach a
> file showing this in the TOV from the par file (i added extra refinement
> levels to illustrate the effect) as well as a plot of the density in the
> torus)...
>
> are the specific parameters for cell-centered hdf5 output or other thorns
> that could take care of that?
>
> best wishes,
>
> Vassili
>
>
>
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>


-- 
Erik Schnetter <schnetter at cct.lsu.edu>
http://www.perimeterinstitute.ca/personal/eschnetter/
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