[FLASH-USERS] flash 4.6 CCSN run problem

[Nilotpal Mukherjee]

Dear Flash users,

I have been trying to run the CCSN setup found in FLASH 4.6, but we
encountered a few issues, similar to what others have reported. Here is a
short summary of what we did so far, and where we are stuck.


We ran 1D CCSN simulation found in flash till just before the
core-bounce(~228 seconds). We then took the data from the last checkpoint
file, and then used this as the starting data for a 2D run.

We encountered the same issue with the EOS convergence. Our EOS was the
LS220_240r_140t_50y_analmu_20120628_SVNr28, though we tried and encountered
the same issue with some of the other EOS's mentioned in the 2013 paper. We
also put in temperature floors, so when temperature fell below the
threshold, energy would be artificially supplied to bring the temperature
back up. This was suggested as a patch for the EOS convergence issue that
kept coming up shortly after core-bounce.

After putting the floor in, the simulation did run for a bit longer, before
it encountered some other errors and aborted. We figured out that the
"nuc_low_eos" was causing some sort of error, so we decided to not rely on
that and use "nuc_eos_full" for all the calculations. We were not able to
single out the problem with the nuc_low_eos.

We saw Nans appear in the leakage scheme, rt_calc_Leak.F90 i.e the dye
value was coming out to be a Nan. What was also surprising was that the
Nans seemed to have some sort of angular dependence, i.e Nans would appear
along certain arcs of calculation (the ye graph is attached ). We then just
decided to set dye equal to 0 whenever it gave a Nan and carry on with the
simulation , this caused the simulation to run the longest (about 130 ms)
after bounce. We are currently trying to figure out why these Nans are
appearing.

I would really appreciate any help/advice on how to solve the issue.

Sincerely,

Nilotpal Mukherjee
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