[yt-users] Bad grid edges in particle fields

[Casey W. Stark]

Thanks Matt.

Good to know that it is Enzo and not a bug either. Is there a FAQ on issues
like this anywhere? It would be very helpful for new users and I would be
happy to document this one.

Best,
Casey


On Tuesday, February 28, 2012, Matthew Turk wrote:

> Hi Casey,
>
> On Mon, Feb 27, 2012 at 11:45 PM, Casey W. Stark <caseywstark at gmail.com<javascript:;>>
> wrote:
> > Hi all.
> >
> > This is a projection of the Dark_Matter_Density field from the initial
> > output of a standard enzo cosmological run with just 2 cores. It looks
> like
> > something is going wrong on the grid boundaries. This occurs for
> projections
> > and slices, but only for gridded particle data. The gas density looks
> fine.
> > It seems to occur at every grid boundary, which I tested by increasing
> the
> > number of cores (so the same number of grids).
>
> This is "real" in the sense that what you're seeing *is* in the data,
> but in fact is not a problem in the simulation.  The grid edges show
> up because particles *should* but *cannot* be interpolated across
> these boundaries during yt, and in Enzo to get them to be interpolated
> at the output time an exchange of boundary conditions has to occur.
> Adding this to Enzo shouldn't be hard; adding it to yt might be
> possible if you extend your other patch to work with smoothed covering
> grids and validate spatial of at least one or two zones.
>
> -Matt
>
> >
> > I can't tell if this is an enzo or yt issue, but I figured I should ask
> here
> > first in case I missed something on the yt side. Has anyone seen this
> > before?
> >
> > Best,
> > Casey
> >
> > P.S. What is the status of the yt image server? Should we attach or imgur
> > images in the future?
> >
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> >
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