Changes between Version 18 and Version 19 of PhysicsDataExplained

Timestamp:

06/10/11 16:34:40 (14 years ago)

Author:

Brandon Shroyer

Comment:

—

PhysicsDataExplained

@@ -23 +23 @@
  * '''''{{{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.
 
- * '''''{{{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}}}).  Options are as follows:
-  * {{{0 -- Constant:}}}  
-  * {{{1 -- Min-Mod:}}}  
+ * '''''{{{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:
+  * {{{0 -- Constant:}}}  A constant limiter function.
+  * {{{1 -- Min-Mod:}}}  Uses the minimum absolute value of the fluxes.
   * {{{2 -- Superbee:}}}  
   * {{{3 -- VanLeer:}}}  
   * {{{4 -- MC:}}}  
+
+For most variables, min-mod ({{{1}}}) is a good default option; however, variables with {{{aux}}} counterparts such as Bx, By, and Bz are exceptions to this rule.  These variables should always use a constant limiter (option {{{0}}}).
 
 [[BR]]