[cig-commits] commit 2427 by bangerth to /var/svn/dealii/aspect

[dealii.demon at gmail.com]

Revision 2427

Augment.

U   trunk/aspect/doc/modules/todo.h


http://www.dealii.org/websvn/revision.php?repname=Aspect+Repository&path=%2F&rev=2427&peg=2427

Diff:
Modified: trunk/aspect/doc/modules/todo.h
===================================================================
--- trunk/aspect/doc/modules/todo.h	2014-04-08 12:47:29 UTC (rev 2426)
+++ trunk/aspect/doc/modules/todo.h	2014-04-08 13:02:51 UTC (rev 2427)
@@ -4,9 +4,15 @@
 <h3>Extensions we'd like to implement</h3>
  
 <ol>
-  <li>Mark compositional fields as either binary 0/1, or fields that sum up to 1.
-  If a field is binary 0/1, use a higher order entropy viscosity.
-  If several fields together sum to one, do something else.
+  <li>Mark compositional fields as to their meaning. This may include:
+  <ol>
+    <li>concentration: $0 \leq c \leq 1$
+    <li>binary: $c \in \{0,1\}$
+    <li>positive: $c \geq 0$
+    <li>level set: $c \in \mathbb{R}$
+    <li>arbitrary: $c \in \mathbb{R}$
+  </ol>
+  Depending on the meaning of a field, we may want to use different artificial viscosity approaches, compression, etc. We may also want to project back into the feasible set when passing compositional values to material models.
 
   <li>Implement "open boundary conditions" as described in "Using open
   sidewalls for modelling self-consistent lithosphere subduction dynamics",