[yt-users] How the field ('gas', 'temperature') was derived?

[Nathan Goldbaum]

Hi Dan,

This particular field is defined specifically for Gadget data in the Gadget
frontend:

https://bitbucket.org/yt_analysis/yt/src/09f0ef297d7068078a021fc8290d9e3519baf82d/yt/frontends/gadget/fields.py?at=yt&fileviewer=file-view-default#fields.py-72

Nathan


On Mon, Jan 2, 2017 at 6:33 AM hudan_bazhaoyu <hudan_bazhaoyu at sjtu.edu.cn>
wrote:

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> Dear yt:
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> I have one simple question, but it bothers me these days.
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> I used the yt to analysis the "hdf5" files, which generated by
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> Gadget-2. These files have basic fields, like: ("PartType0", "*"),
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> ("PartType1", "*") and ("all", "*"). Then I want to plot the density
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> map and temperature map, it seems need some derived fields, like:
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> ("gas", "density") and ("gas", "temperature").
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> I'm curious about how the ("gas","temperature") was derived, so I
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> browsed a lots of documents on the Web, but found nothing. Please
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> see
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> http://yt-project.org/doc/reference/field_list.html?highlight=field%20list
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> About the field of ('gas','temperature'),  there is "No source
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> available" in "Field Source"!
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> In my data, the field ("PartType0","InternalEnergy") is provided by
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> me, and I think the temperature should calculated by Internal Energy
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> "E" with the function: k*T = (Gamma -1)*µ*mp*E, where k = 1.38E-16
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> erg/K is Boltzmann constant, Gamma = 5/3 for adiabat particles, μ =
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> 0.6 is the corresponding mean molecular weight, and mp = 1.67E-24 g
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> is proton mass. But this result is about half of the value of
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> ("gas","temperature").
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> So what you may know is why, which one is right? I need your help!
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> Thank you a lot, and happy new year!
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> Regard,
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> Dan
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>  --
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> Dan Hu
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> =======================================
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> Department of Physics, Shanghai Jiao Tong
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> University
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> 800 Dongchuan Road, Minhang, Shanghai 200240, PRC
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> E-mail : hudan_bazhaoyu at 163.com
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>              hudan_bazhaoyu at sjtu.edu.cn
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> =======================================
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