[yt-users] Density profile issue

Jun-Hwan Choi jhchoi at pa.uky.edu
Tue Jan 8 18:59:10 PST 2013


Thank you Britton, it resolves the conflict.
Junhwan


On Tue, Jan 8, 2013 at 1:01 PM, Britton Smith <brittonsmith at gmail.com>wrote:

> Hi Jun-Hwan,
>
> I'm mostly guessing here, but when you profile a field, it defaults to
> doing a mass-weighted profile, such that the value for any bin in the
> profile is:
> Sum (field * mass) / Sum (mass).
> If your object is a very flat disk, then there is probably not much mass
> outside the plane of the disk, so even when you do a spherical profile, the
> cells in the disk are dominating the average.  My guess is that if you
> switch to doing a volume-weighted profile of the density, you will get
> answers that differ more.  You can do that in the add_field call by adding
> weight_field="CellVolume".
>
> Britton
>
>
> On Tue, Jan 8, 2013 at 12:50 PM, Jun-Hwan Choi <jhchoi at pa.uky.edu> wrote:
>
>> Hi all,
>>
>> I have a gas disk simulation and try to compute gas density profile.
>> I generate to make spherical average density profile by feeding a sphere
>> object to the BinnedProfile1D and cylindrical average density profile by
>> feeding a disk object to the BinnedProfile1D.
>> Surprisingly, both density profile is almost the same.
>> Does any one have idea why?
>> FYI, I past my yt script at  http://paste.yt-project.org/**show/3046/<http://paste.yt-project.org/show/3046/>.
>>
>> Thank you in advance.
>> Junhwan
>>
>>
>> --
>> ------------------------------**------------------------------**--
>> Jun-Hwan Choi, Ph.D.
>> Department of Physics and Astronomy, University of Kentucky
>> Tel: (859) 897-6737        Fax: (859) 323-2846
>> Email: jhchoi at pa.uky.edu   URL: http://www.pa.uky.edu/~jhchoi
>> ------------------------------**------------------------------**--
>>
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-- 
--------------------------------------------------------------
Jun-Hwan Choi, Ph.D.
Department of Physics and Astronomy, University of Kentucky
Tel: (859) 897-6737        Fax: (859) 323-2846
Email: jhchoi at pa.uky.edu   URL: http://www.pa.uky.edu/~jhchoi
--------------------------------------------------------------
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