Elliptic dudes (esp. Bernd),

I am using BAM to implement maximal slicing for 2 NS runs.  
However, BAM seems to give bad high frequency noise, as seen
by this snapshot of trK along the x line, which
is the axis joining the center of the 2 neutron stars (trK_ns.gif).

Wai-Mo remembered that I did a high-resolution run with misner
BH data, and we see the same thing (high frequency noise getting
worse in time).  Again, this is using maximal slicing with BAM.
(trK_misner.gif).

I notice in the 2 NS case, the trK is much smoother when using
SOR.  My question:  Bernd, is there any way to make BAM
spend more time at the top of the V cycle?  That is, do
a few more sweeps on the fine grid?  Or shall we code up 

maximal = "bam-sor"

that would call bam as a preconditioner to SOR?

Mark
 


------------------------------------------------
Mark Miller
Department of Physics
Washington University
St. Louis, MO  63130-4899
E-mail: mamiller@wugrav.wustl.edu
office phone: (314) 935-4617,  fax: (314) 935-6219
------------------------------------------------

Filename: trK_ns.gif
Size :57329

Filename: trK_misner.gif
Size :83717

Created for the WUGRAV CoCoBoard Page Projects Page.

Created by The CoCoBoard.