Changes between Version 19 and Version 20 of PhysicsDataExplained

Timestamp:

06/10/11 16:57:03 (14 years ago)

Author:

Brandon Shroyer

Comment:

—

PhysicsDataExplained

@@ -25 +25 @@
  * '''''{{{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:}}}  
+  * {{{1 -- Min-Mod:}}}  Uses the minimum absolute value of the fluxes.  This is the most diffusive of our flux limiters.
+  * {{{2 -- Superbee:}}}  The [http://en.wikipedia.org/wiki/Flux_limiter Superbee] flux limiter.  This option is less diffusive than the other options, and is best for high-resolution problems with no strong shocks.
+  * {{{3 -- VanLeer:}}}  Uses the Van Leer limiter from the original [http://en.wikipedia.org/wiki/MUSCL_scheme MUSCL] scheme.
+  * {{{4 -- MC:}}}  A monotone-centered flux limiter.
 
-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}}}).
+ These limiters are defined in the {{{data/slopelim.f90}}} file.  For most variables, min-mod (option {{{1}}}) is a good default choice; 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}}}).
 
+ * '''''{{{lSelfGravity:}}}'''''  A boolean flag that turns self-gravity on or off.  If your problem needs self-gravity, then this should be set to {{{.true.}}} and the [http://clover.pas.rochester.edu/trac/astrobear/wiki/GlobalDataExplained#PoissonData PoissonData] namelist needs to be properly assembled in {{{global.data}}}.  If your problem does not use self-gravity, then leave {{{lSelfGravity}}} set to {{{.false.}}}
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