[Yt-svn] yt-commit r696 - trunk/yt/lagos

[britton at wrangler.dreamhost.com]

Author: britton
Date: Fri Jul 25 16:19:56 2008
New Revision: 696
URL: http://yt.spacepope.org/changeset/696

Log:
Added JeansMassMsun field.

Finished the last of the root beer.

25 July, 2008

Britton Smith



Modified:
   trunk/yt/lagos/DerivedFields.py

Modified: trunk/yt/lagos/DerivedFields.py
==============================================================================
--- trunk/yt/lagos/DerivedFields.py	(original)
+++ trunk/yt/lagos/DerivedFields.py	Fri Jul 25 16:19:56 2008
@@ -44,6 +44,9 @@
 clight = 3.0e10 # cm/s
 kboltz = 1.38e-16 # erg K^-1
 G = 6.67e-8   # cm^3 g^-1 s^-2
+Msun2g = 1.989e33
+MJ_constant = (((5*kboltz)/(G*mh))**(1.5)) * (3/(4*pi))**(0.5) / Msun2g
+
 
 class FieldInfoContainer: # We are all Borg.
     _shared_state = {}
@@ -575,6 +578,13 @@
 add_field("NumberDensity", units=r"\rm{cm}^{-3}",
           convert_function=_ConvertNumberDensity)
 
+def JeansMassMsun(field,data):
+    return (MJ_constant * 
+            ((data["Temperature"]/data["MeanMolecularWeight"])**(1.5)) *
+            (data["Density"]**(-0.5)))
+add_field("JeansMassMsun",function=JeansMassMsun,units=r"\rm{Msun}")
+
+
 def _CellMass(field, data):
     return data["Density"] * data["CellVolume"]
 def _convertCellMassMsun(data):