[ET Trac] [Einstein Toolkit] #1322: CarpetRegrid2 movement_threshold

Einstein Toolkit trac-noreply at einsteintoolkit.org
Wed Apr 17 03:49:26 CDT 2013

#1322: CarpetRegrid2 movement_threshold
 Reporter:  vassilios.mewes@…      |       Owner:            
     Type:  defect                 |      Status:  new       
 Priority:  minor                  |   Milestone:            
Component:  EinsteinToolkit thorn  |     Version:  ET_2012_11
 Keywords:  CarpetRegrid2          |  
 i have got a question about the CarpetRegrid2 process of regridding when
 supplying the thorn with information from puncture tracker...

 in a recent simulation of BH+torus system i did, the BH was moving
 significantly further than the movement_threshold i supplied in the par
 file, but Carpet never regridded...it seems to me that the new center is
 set at a frequency of regrid_every, but shouldn't it be reset only when
 the center has moved further than the movement_threshold parameter? as it
 seems to me at the moment, i would have to know the movement of the BH a
 priori in order to chose a sensible regridding frequency, because if the
 BH moves too little between regrid_every, it will eventually move out of
 the finest refinement level..
 furthermore, the regridding frequency might change during the run because
 the BH is actually accelerating...

 i am doing something wrong here or setting false parameters?

Ticket URL: <https://trac.einsteintoolkit.org/ticket/1322>
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