[yt-users] load structured mesh

[Andrea Negri]

Hi John,

unfortunately I have a cell spacing varying inside a grid. A viable
way would be to interpolate my data on a regular grid, and then load
it.
The interpolation part is not so computationally demanding (I have
already tested it), it is just the plotting which is slow process (I'm
talking of plotting a slice).
Maybe this can be improved by building a set of grid with lower and
lower resolution. Is there any documentation on how t he grid in the
grid data format should be?


Andrea

On 3 May 2016 at 01:37, John ZuHone <jzuhone at gmail.com> wrote:
> If by "non-uniform" you mean that you have grids of differing resolutions
> then yt and grid data format support that, but if you have cell spacing
> varying _inside_ a grid then yt does not yet support this. We're working on
> it, but it will probably take some time before it is operational.
>
>
> =================================
> John ZuHone, Chandra/ACIS operations
> Harvard-Smithsonian Center for Astrophysics
>
> 60 Garden St., MS-67       (w) 617-496-1816
> Cambridge, MA 02138.     (m) 781-708-5004
>
> john.zuhone at cfa.harvard.edu
> http://hea-www.cfa.harvard.edu/~jzuhone
> =================================
>
> On May 2, 2016, at 7:18 PM, Andrea Negri <negri.andre at gmail.com> wrote:
>
> Dear John,
>
> thanks for the suggestions. Do you know if the grid data format is
> compatible with a non uniform mesh? I was thinking of porting my
> outputs in this format.
>
>
> Cheers,
> Andrea
>
> On 2 May 2016 at 18:52, John Zuhone <jzuhone at gmail.com> wrote:
>
> Hi Andrea,
>
>
> yt has some support for axisymmetric grids in 2D, so you won’t need to
> convert to a 3D array.
>
>
> The bigger issue is the logarithmic grid spacing. This is currently being
> worked on, but is in a very early state. Currently what it does is use
> “logr” as the coordinate instead of r, which may not be very ideal for every
> situation. A lot of yt functionality is probably not compatible with this
> way of doing things.
>
>
> Nevertheless, if you would like to explore it further, let us know.
>
>
> Best,
>
>
> John Z
>
>
> On May 2, 2016, at 10:53 AM, Andrea Negri <negri.andre at gmail.com> wrote:
>
>
> Of course. I have a 2.5D simulation in spherical coordinates. It is
>
> axial symmetric, so the actual grid is 2D, r and theta. The grid is
>
> structured, the grid spacing in theta is constant, while the spacing
>
> in r follows a geometrical progression, i.e. dr[i+1] = dr[i] * factor,
>
> where factor is a constant.
>
>
> I don't know if yt supports axisymmetric grids, but I can bypass this
>
> issue by duplicating the 2D array into a 3D one. Sure, it is not
>
> efficient...
>
>
> My ultimate goal is to produce projections, off axis projections and
>
> mock X-ray observations.
>
>
>
> Thanks,
>
> Andrea
>
>
> On 2 May 2016 at 16:43, Nathan Goldbaum <nathan12343 at gmail.com> wrote:
>
> Can you share a little bit more detail about your grid structure? I know
>
> that support for log-radial bins is being worked on right now, for example.
>
>
> On Mon, May 2, 2016 at 3:18 AM, Andrea Negri <negri.andre at gmail.com> wrote:
>
>
> Hi all,
>
>
> I'm trying to read ZEUS-MP 2 data, and I'm building my programs step
>
> by step. I was able to load data regularly spaced in spherical
>
> coordinates. However, I actually have a non-uniform radial grid.
>
>
> I tried with the script in attachment, but I have got odd errors...
>
>
> Also, I have found this page, is it relevant for my case (just because
>
> my code is mentioned, the answer would be yes :) )?
>
> https://bitbucket.org/yt_analysis/grid_data_format
>
>
>
> Thanks,
>
> Andrea
>
>
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