Restarting from a checkpoint with a different base grid

[RSuryaNarayan]

Hi,

Is there a way to interpolate checkpoint data from a fine base grid (say 1024 x 1024) to a coarse grid (512 x 512)?

Could I use PeleAnalysis for that in any way?

Thanks!

[marchdf]

Hi, apologies for leaving you hanging here. I completely missed this question. I would recommend using the initialize from plot file capability. This will interpolate a plot file onto any grid and use that as the initial condition (time will be reset to 0): pelec.init_pltfile = "plt00000". More info here: https://amrex-combustion.github.io/PeleC/InputFiles.html

[RSuryaNarayan]

Thanks once again! no worries. I will try this out!

[mikaelm123]

Hello,
I attempted to start from a plt file and a chk file while changing the grid resolution by doubling it or halving it. Each time I started from a different resolution from either file it throws a Segfault error. However, starting from those files without changing the resolution works just fine. Are there any additional steps to take besides the ones listed above to use the interpolation feature?

Thanks in advance.

[SKT-Bush]

Hello mikaelm, I have encountered the same problem, have you solved it?

[baperry2]

@SKT-Bush this problem was resolved for restarting on a finer base grid in #645. You need to add pelec.init_pltfile_coarse_levels = 1 to your input file if refining by a factor of two (see documentation: https://amrex-combustion.github.io/PeleC/InputFiles.html#input-files-and-controls).

We do not support restarting on a coarser base grid.

[SKT-Bush]

Thank you very much, Mr.baperry2! The documentation is very detailed, I will read it carefully.