[grath]

Hello everyone,

I really want to clarify a subject: initialization from Map or Restart files.

I perform an ICE simulation with multiple cycles on Converge 4.1.
So, I write MAP files at specified times and I activated restart file writing every 10degCA with a 3-file limit.

My case crashes due to memory reasons, not numerical or physical issues.

Now, I would like to restart my case from a restart.rst file, but there are extrapolation errors, CFL_min, and it crashes very quickly. So I want to clarify the procedure.

Do you have any idea of the reason and/or a solution?

My understanding of the procedure is (could be incorrect):
Initialize from a MAP file:
- Put map.h5 in the root folder
- Activate MAP in input.in
- Specify initialization degCA according to MAP in input.in
- Specify the map file name and settings in map.in

Initialize from a restart file:
- Put restartXYZ.rst in the root folder
- Activate Restart and specify the restart number (XYZ) in input.in
- Specify initialization degCA according to restartXYZ.rst in input.in

Please don't hesitate to correct these procedures to clarify this subject.

Have a good day.
Sincerely.

[MFGT]

Overall this sounds correct. Important to note that mapping can be done from rst. files as well. I typically do this as I simulate single engine cylces from -540 to +180 and use the restart file as initialization for the following cylce. Also, you dont need to copy the file as you can specify the path directly if its in a different folder.
Starting crank angle has to match the map file crank angle for useful mapping of course. Actual grid distribution will not be used!

Originally Posted by grath

My understanding of the procedure is (could be incorrect):
Initialize from a MAP file:
- Put map.h5 in the root folder
- Activate MAP in input.in
- Specify initialization degCA according to MAP in input.in
- Specify the map file name and settings in map.in

Initialize from a restart file:
- Put restartXYZ.rst in the root folder
- Activate Restart and specify the restart number (XYZ) in input.in
- Specify initialization degCA according to restartXYZ.rst in input.in

The restart number is not linked to the XYZ of the file, nor the starting crank angle has to be modified. I typically leave the number to 0.
Basically I copy the whole input files + restart file into a new folder and manually set restart_flag to 1 and thats it.

Restarts do not allow geometry changes as fair as I know.


If a case has crashed I prefer a simple restart as the output files can be combined afterwards very easily.