Changes between Version 26 and Version 27 of PhysicsDataExplained

Timestamp:

06/12/11 14:55:45 (14 years ago)

Author:

Brandon Shroyer

Comment:

—

PhysicsDataExplained

@@ -21 +21 @@
  * '''''{{{Xmu:}}}'''''  The mean molecular weight of the gas.  This is sometimes used in conjunction with the mass of a hydrogen atom to determine the number density and temperature scales.  A value of 1.0 is usually used for atomic hydrogen, or 0.5 for molecular hydrogen.
 
- * '''''{{{MinTemp:}}}''''' Sets a minimum temperature within the domain.  This should be set to 0.0 if there is no cooling.  If there is cooling, then start by setting it to something low, in the 10^-10^ to 10^-6^ range.  If this parameter is set too high, then it could wind up injecting extra thermal energy into the system.
+ * '''''{{{MinTemp:}}}'''''  Sets a minimum temperature within the domain.  This should be set to 0.0 if there is no cooling.  If there is cooling, then start by setting it to something low, in the 10^-10^ to 10^-6^ range.  If this parameter is set too high, then it could wind up injecting extra thermal energy into the system.
+
+ * '''''{{{MinDensity:}}}'''''  Sets a minimum density within the domain.  This does not need to be a large value; the default is 10^-30^, and 10^-10^ is most common value in the data files.  Be wary of using large {{{MinDensity}}} values, which can  undermine conservation laws by injecting extra matter into the system. Under no circumstances should {{{MinDensity}}} ever be ''less'' than 0.
 
  * '''''{{{InterpOpts:}}}'''''  A multi-integer array that sets the interpolation options for cell-centered variables.  The size of this array is equal to the number of physical variables ({{{NrPhysicalVars}}}).  The interpolation options are actually [http://en.wikipedia.org/wiki/Flux_limiter flux limiters] that prevent spurious numerical oscillations.  The options are as follows:
@@ -45 +47 @@
  All three options use the same scale:  {{{0}}} (no output), {{{1}}} (minimal output), {{{2}}} (all messages).
 
- * '''''{{{iProtect:}}}''''' An integer value that sets the [ProtectionOfVariables variable protection] options for the simulation:
-  * {{{0 -- No variable protection}}}
-  * {{{1 -- 
 
 [[BR]]