#1879 closed help (answered)
run failure with Error Message: Convergence failure in BiCGstab
Reported by: | dpolson | Owned by: | um_support |
---|---|---|---|
Component: | UM Model | Keywords: | |
Cc: | Platform: | ARCHER | |
UM Version: | 8.5 |
Description
Hi,
I'm running an N216 version of HadGEM3-A for 01/09/2000 to 01/09/2001 and it's crashing after a couple of months with the error:
? Error in routine: eg_sl_helmholtzApplication 21617299 is crashing. ATP analysis proceeding…
? Error Code: 1
? Error Message: Convergence failure in BiCGstab
job is xmqwa,
output is in ~dpolson/output/xmqwa003.xmqwa.d16133.t014453.leave
and /work/n02/n02/dpolson/xmqwa/
I'm not familiar with why the model would be crashing so I'm hoping you can point me in the right direction.
Thanks
Debbie
Change History (5)
comment:1 Changed 5 years ago by grenville
comment:2 Changed 5 years ago by dpolson
Is should be a pretty standard run, the only thing I really changed was to add some aerosol related diagnostics.
IS there a way to perturb the data from the previous month slightly to avoid encountering the same instability?
Debbie
comment:3 Changed 5 years ago by grenville
Debbie
Changing dump frequency may be enough to do that. Alternatively if you write a dump just prior to the failure, then reconfigure that dump and carry on the run with it, that may work.
You could also try reducing the time step - maybe just to get past the instability, then return it to it's normal value.
Grenville
comment:4 Changed 5 years ago by grenville
- Resolution set to answered
- Status changed from new to closed
Closed for lack of activity
comment:5 Changed 3 years ago by willie
- Platform set to ARCHER
Debbie
This is typically the result of some numerical instability in the model. It's hard to say why this has happened. You need some more diagnostics — try dumping on a few time steps prior to the failure and examine examine the fields.
How does this model differ from the standard HadGEM3-A if at all.
Grenville