[yt-users] Conversion of Arepo file into Enzo format?

[John Wise]

Hi Anna,

I've converted Gadget datasets to Enzo in the past (circa 2004!).  I 
used qhull to generate a Voronoi tessellation that was then used for 
interpolation to a Cartesian grid.  Then I manually refined that grid, 
flagging cells for refinement, and interpolating to finer grids around 
those cells.  After all of this, I wrote a complete Enzo dataset out 
(grid files, hierarchy, and parameter file) from scratch.  Be 
forewarned: there is some numerical noise created during the conversion, 
so we needed to let the system relax over a sound-crossing time.

I think you can do this with the tools provided in yt.  It's not 
straightforward, but it's doable.  I remember it took me about 2 weeks 
as a 3rd year PhD student (using IDL...), starting from scratch.

You'll have to regenerate the hierarchy file and parameter file.  There 
is no mechanism to write them out, so you'll have to reverse engineer 
Enzo's write routines in python.  I'm not too familiar with the octree 
in yt, but you should be able to turn those interpolated grids into an 
Enzo dataset, using h5py to write files directly in the Enzo format.

I hope this gets you started in the right direction, and I think using 
yt as an interpreter between formats is the easiest way forward.

Thanks,
John

On 10/11/2017 12:03 AM, Maan Hani wrote:
> Hi all,
> 
> As far as I know, no-one has used the Voronoi grid to create the derived fields. However, you can simply read the Arepo data as a Gadget dataset. I have done that in the past and it works just fine with minor issues. I will try and cleanup the backend I cannibalized and maybe add it to yt as a temporary fix.
> 
> Cheers,
> Maan
> 
> 
> --------------------------------------------------------------------------------------
> Maan H. Hani                                    www.astro.uvic.ca/~mhani
> Vanier Scholar - PhD. Candidate
> 
> Dept. of Physics & Astronomy        Tel  : +1 250 721 8845
> University of Victoria                        Fax: +1 250 721 7715
> PO Box 1700 STN CSC
> Victoria, BC, V8W 2Y2
> Canada
> 
> ________________________________________
> From: yt-users <yt-users-bounces at lists.spacepope.org> on behalf of aschauer at usm.lmu.de <aschauer at usm.lmu.de>
> Sent: Tuesday, October 10, 2017 7:54 AM
> To: Discussion of the yt analysis package
> Cc: glover at uni-heidelberg.de; turlough.downes at dcu.ie; john.regan at dcu.ie; klessen at uni-heidelberg.de
> Subject: [yt-users] Conversion of Arepo file into Enzo format?
> 
> Dear usergroup,
> 
> we are currently thinking of mapping an output from an Arepo
> simulation (in the hdf5 file format) to Enzo. We are wondering if
> someone has done this before and could help us or if this even is
> somehow incorporated into yt.
> 
> Thanks for your help!
> 
> Best regards,
> Anna
> 
> 
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-- 
John Wise
Associate Professor of Physics
Center for Relativistic Astrophysics, Georgia Tech
http://cosmo.gatech.edu