Hi Nathan.<div><br></div><div>I&#39;m also worried about this and I agree that fields with the same name should all be consistent. I would support some sort of cleanup of frontend fields, and I can get the Nyx fields in line and help with Enzo. </div>

<div><br></div><div>I doubt we can do this, but I would prefer changing the field names as part of the removing enzo-isms and geometry handling refactoring pushes. For instance, the field in Orion could be thermal_energy_density and the field in Enzo could be specific_thermal_energy. I also noticed this issue when I was using &quot;Density&quot; in Enzo (proper density in cgs) and &quot;density&quot; in Nyx (comoving density in cgs).</div>


<div><br></div><div>Best,</div><div>Casey</div><div><br></div><div><br><div class="gmail_quote">On Wed, Mar 28, 2012 at 1:47 PM, Nathan Goldbaum <span dir="ltr">&lt;<a href="mailto:goldbaum@ucolick.org" target="_blank">goldbaum@ucolick.org</a>&gt;</span> wrote:<br>


<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi all,<br>
<br>
On IRC today we noticed that Orion defines its ThermalEnergy field per unit volume but Enzo and FLASH define ThermalEnergy per unit mass.  Is this a problem?  Since yt defaults to the Enzo field names, should we try to make sure that all fields are defined using the same units as in Enzo?  Is there a convention for how different codes should define derived fields that are aliased to Enzo fields?<br>



<br>
One problem for this particular example is that the Pressure field is defined in terms of ThermalEnergy in universal_fields.py so the units of ThermalEnergy become important if a user merely wants the gas pressure in the simulation.<br>



<br>
One possible solution for this issue would be the units overhaul we&#39;re planning. If all fields are associated with a unit object, we can simply query the units to ensure that units are taken care of correctly and code-to-code comparisons aren&#39;t sensitive to the units chosen for fields in the frontend.<br>



<br>
Personally, I think it would be best if we could make sure that all of the fields aliased to Enzo fields have the same units.<br>
<br>
Nathan Goldbaum<br>
Graduate Student<br>
Astronomy &amp; Astrophysics, UCSC<br>
<a href="mailto:goldbaum@ucolick.org" target="_blank">goldbaum@ucolick.org</a><br>
<a href="http://www.ucolick.org/~goldbaum" target="_blank">http://www.ucolick.org/~goldbaum</a><br>
<br>
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</blockquote></div><br></div>