Getting a perfect restart with ROMS

General scientific issues regarding ROMS

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Getting a perfect restart with ROMS

#1 Post by lanerolle » Sat Feb 19, 2005 12:07 am

Is it possible with a suitable set of values for NRREC and LCYCLE, etc.
(in the input file) to achieve a perfect restart computation with
ROMS - so that the restart computation will proceed as if the original
computation was uninterrupted? As ROMS has a higher order time marching
scheme, at each restart designation (multiple of NRST), it would be necessary
to write out multiple (>=2) consecutive time-slabs of information but it appears
that only one set of information is written into the restart netcdf file and hence
a perfect restart does not appear to be feasible. Is this correct?

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#2 Post by kate » Wed Feb 23, 2005 7:57 pm

This is correct. In the days of SPEM, we achieved perfect restart by doing a low-order timestep after each restart record was written. This has been deemed a silly thing to do and has been taken out in ROMS. Imperfect restart is the least of my worries.

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