Hi Roland:
Roland Haas wrote:
Hello Bruno,
a) Its evolution is stopped with Nans around 8.6M. Nans appear to come from the BSSN fields, but still needs further investigation.
Hmm I could evolve the qc0 example in McLachlan. Maybe there are differences in the parameter file that make the error "obvious".
A few obvious changes that I can think of:
1) I reduced the number of spherical surfaces from 5 to 3. Now the puncture tracker uses surfaces 0 and 1, AHFinderDirect track those surfaces and load AH related info there. QLM, CarpetTracker and CarpetMask uses those 2 surfaces then. I will go back to 5 surfaces as it was set before. Maybe I am missing some subtle scheduling order here. I don't know.
2) I added a few general parameters I am used to use to CarpetInterp, CarpetLib and CarpetRegrid2.
3) From a discussion I had with Peter on the ET workshop, I decided to change the AHFinderDirect interpolator to Hermite.
So I will switch back to what it was and avoid to do so many changes at once! :) However I find strange that these changes could be the cause of what I am seeing.
c) When CarpetReduce::weight is output, its values seem strange to me. Most of the domain has 1/2 set. A few points close to the boundary 1/4 and the boundaries 0 (physical and ghost). No mask out values inside AH is shown, ie they still are set to 1/2. These values seem to make more sense to AMR restriction operations.
Are you maybe looking at the z=0 plane? That plane has a weight of 1/2 since only half of the volume of each cell is used when eg. computing the simulation volume. I have never used CarpetMask myself (but have written a similar thorn of my own... would have paid to look into Carpet first I guess :-) )
Yes I was looking at the z=0 plane and had refection symmetry set up! Thanks for pointing this out. If we go out of the plane then the weight=1.0 values show up. A more careful look into the data, I noticed the zeros are set in the buffer zones indeed with the exception of the third point (ghostzone=3) in the domain (from the AMR boundary) that has its value set to 1/4. Do you know why?
Thanks, Bruno.
Yours Roland
Users mailing list Users@einsteintoolkit.org http://lists.einsteintoolkit.org/mailman/listinfo/users