[yt-users] Making density and velocity field

[Nathan Goldbaum]

On Thursday, April 23, 2015, Junhwan Choi (최준환) <choi.junhwan at gmail.com>
wrote:

> Hi yt users,
>
> I have a few questions regarding to density and velocity field.
> I try to make the 3-dimension dark matter and baryon density and
> velocity fields from enzo simulation.
> In order to use SPH/CIC smoothing, I tried to use ('deposit',
> 'Dark_Matter_cic') for enzo dark matter, and it does not work.
> What is particletype for Dark Matter density and velocity in enzo?


There is no predefined dark matter particle type. You will need to create
one using a particle filter.


>
> After making the density field, I would like to deposit the density
> for fixed grid cube.
> I knew the FixedResolutionBuffer, that does a similar thing for 2D,
> but I can not find 3D version of the similar object.
> Is there any such object (uni-grid Buffer) for 3D?


You're looking for a covering grid.


>
> Lastly, I try to use the dark matter velocity arrow with
> annotate_velocity(), but it looks to me that the annotation only works
> for gas,
> because it does not have any argument distinct field type.
> How can I plot the dark matter (or particle in general) velocity arrow in
> yt?


You can use the annotate_quiver function.


>
> Thank you in advance,
> Junhwan
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