[yt-users] RAMSES MHD visualisation weirdness

[Sam Geen]

Hi Nathan,

Ah, thanks, you just gave me an idea - the MHD code (for some reason, 
I've no idea why) has 3 extra variables than NVAR, and the RAMSES 
frontend currently assumes that the output is reliably reporting the 
number of variables, so it could be getting confused. I'll try that 
tomorrow; you're right that this could be causing the visualisation to 
wig out. This could be a bug/feature that's worth changing in RAMSES 
itself as it's quite confusing, but since it's existed for a while now 
it might be simpler just to work around it in YT somehow.

I'll look at getting together some simple MHD test problems and making 
some outputs, too - there's at least one included with RAMSES so I'll 
try running that now and contact you once I'm done.

Sam

On 11/02/14 19:02, Nathan Goldbaum wrote:
> Hi Sam,
>
> Can you share the script you're using to make that plot?  In
> particular I'd like to see the call you use to load the dataset, since
> the number of fields you request and their order can matter a lot for
> the RAMSES data format.
>
> It would also be nice to have a public RAMSES MHD test dataset - there
> doesn't appear to be one on yt-project.org. If you (or anyone else on
> the list) has one to share, that should help in debugging RAMSES MHD
> issues in the future. If so, contact me off-list and we can work out
> how to share the data.
>
> -Nathan
>
>
> On Tue, Feb 11, 2014 at 7:58 AM, Sam Geen <samgeen at astro.ox.ac.uk> wrote:
>> Hi,
>>
>> I tried visualising a RAMSES MHD output in YT and got this weird effect:
>> http://i.imgur.com/abjRorm.png (this happens for slices and projections)
>>
>> Any idea what could be causing this? Nearly-identical non-MHD simulations
>> seem to visualise fine, and it happened for every MHD output I've looked at.
>> I can give more info if you like, although I'm not sure what diagnostics to
>> check for, so pointers on how to hunt this down would be appreciated as
>> well! It's entirely possible it's a bug/side-effect of the MHD solver,
>> although I'm not sure what, and other visualisation routines (in
>> IDL/Fortran) seem to work fine with some of the outputs I've tried on it.
>>
>> Thanks,
>>
>> Sam
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