Adding fixed timestep option

Will update documentation.tex later today.


git-svn-id: http://svn.cactuscode.org/arrangements/CactusBase/Time/trunk@27 5633253d-7678-4964-a54d-f87795f8ee59

1 files changed, 10 insertions, 3 deletions

diff --git a/README b/README
index aae1da0..3f731b9 100644
--- a/README
+++ b/README
@@ -3,8 +3,15 @@ Authors    : Gabrielle Allen
 CVS info   : $Header$
 --------------------------------------------------------------------------
 
-Thorn Time sets the timestep for an evolution. Currently it
-uses a simple Courant condition with speed one. That is
+Thorn Time sets the timestep for the simulation by either
+
+	- setting the timestep directly from a parameter value
+
+	- using a Courant-type condition to set the timestep based
+	  on the grid-spacing used.
+
+The Courant condition can be applied either once at the start of the
+simulation, or the timestep can be calculated dynamically before each timestep.
+
 
-cctk_delta_time = dtfac * min(cctk_delta_space)