[yt-users] units error in cloud-in-cell construction in yt

[Brian O'Shea]

Hi Britton,

Yes, I have some.  Look on galactica.pa.msu.edu in /data/gomez/halo1_128 -
there are data outputs at many different redshifts.  Each output is 67 MB,
128^3 particles (or thereabouts).

--Brian



On Mon, Aug 4, 2014 at 12:07 PM, Britton Smith <brittonsmith at gmail.com>
wrote:

> Hi all,
>
> I am trying to debug this, but it would help if I had a small cosmological
> Gadget dataset at a redshift greater (significantly if possible) than 0.
>  Does anyone have anything like this they could share?
>
> Britton
>
>
> On Mon, Aug 4, 2014 at 4:17 PM, Brendan Griffen <
> brendan.f.griffen at gmail.com> wrote:
>
>> Hi,
>>
>> I've been trying to construct a CiC mesh but couldn't get an answer
>> comparable with theory for the mean density of the mesh yt gave me.
>>
>> I've put all the relevant code and output in a pastebin here:
>> http://pastebin.com/hbVM0rYN
>>
>> I've spoken with Britton Smith and he thinks the physical size of the
>> mesh might be wrong by a factor of (1+z) which translates to the densities
>> all being off by (1+z)^3. There also seems to be a missing h**3 somewhere
>> which brings everything in "rough" alignment.
>>
>> I've run it for two redshifts z = 46 and z = 0 and put the output in the
>> above pastebin. I've added a correction where I forcefully put /(1+z)^3
>> term at the end and it gives reasonable results. I've also added another
>> two values including the missing /h**3 term.
>>
>> Can this be corrected or can someone tell me where I went wrong in what
>> I'm doing? Thanks!
>>
>> Brendan
>>
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>>
>
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