[yt-dev] DarkMatter Particles in Enzo + yt 3.0

[Matthew Turk]

Hi Stephen,

Since we have the luxury in this particular case of addressing both supply
side and consumer side behavior, my inclination is for the more elegant
solution. In this case, I would say that is option two, where particles are
explicitly noted in the Enzo output.

Matt
On Dec 18, 2012 11:00 AM, "Stephen Skory" <s at skory.us> wrote:

> Hi all,
>
> I am starting to have potentially useful active particles in Enzo 3.0,
> and I'd like to look at them with yt 3.0. However, I'm still running
> into some problems accessing the active particles (APs).
>
> Specifically, the problems seems to be that in
> frontends/enzo/data_structures.py it's only looking for APs identified
> through parameter_file.parameters["AppendActiveParticleType"], but
> "DarkMatter" isn't listed as an AP type in the Enzo parameter file.
> Also, the inner loop over HDF5 AP group members in
> _detect_active_particle_fields(self) includes the "DarkMatter" field,
> which isn't expected, and causes a KeyError for the dict that is being
> built there.
>
> I think that there are a couple potential fixes for this (that I'm
> willing to do/help with), and I'd like your thoughts on them, please:
>
> 1. Modify yt such that the "DarkMatter" AP field is treated more like
> the non-AP fields, meaning that instead of using the
> "AppendActiveParticleType" parameter as the driver for searching,
> instead auto-detect "DarkMatter". Unlike other APs, "DarkMatter"
> should be in most grids and random auto-detection should work.
>
> 2. In Enzo include "DarkMatter" as a dummy AP type which would have
> the main/only effect of including "DarkMatter" as a
> "AppendActiveParticleType" parameter. I think that this would address
> all of the present issues with yt. Or perhaps even better, introduce a
> new Enzo parameter "ParticleTypesPresent" that would be
> ("AppendActiveParticleType") + "DarkMatter" most of the time.
>
> Thank you for your thoughts!
>
> --
> Stephen Skory
> s at skory.us
> http://stephenskory.com/
> 510.621.3687 (google voice)
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