Opened 7 years ago
Closed 5 years ago
#1785 closed Bug (wontfix)
reproductibility with tke / dependence on the number of subdomains
Reported by: | julienjouanno | Owned by: | rbourdal |
---|---|---|---|
Priority: | normal | Milestone: | |
Component: | OCE | Version: | v3.6 |
Severity: | minor | Keywords: | TKE |
Cc: | rbourdal |
Description
Context
Setup of regional configuration with bdy / tke / ubs on momentum / fct for tracers / trunk (version 6980)
Results depends on the number of subdomains.
It seems to works fine when using small number of subdomain (e.g. jpnij=80; jpnj=10,jpni=8) whereas the use of large number of procs (> 100) leads to very strange results.
See figure that shows the surface meridional velocity when using 10x8 subdomains (top) and 20x8 subdomains (bottom).
Analysis
- The error is not dependent of the machine (same problem on both curie and occigen supercomputers)
- Using GLS instead of TKE resolve this issue (solution does not depend on the nuùmber of subdomains)
- We see a strong imprint of the wind stress field in the corrupted case (bottom figure) additionaly suggesting that this is an issue with zdf/tke.
- Figures are shown for a case that do not use key_agrif, but when using an agrif zoom, only the parent grid seems to be affected
Commit History (0)
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Attachments (3)
Change History (8)
Changed 7 years ago by julienjouanno
Changed 7 years ago by julienjouanno
zonal surface velocity in the parent grid when using agrif : 4x10 subdomains (top) vs 14*10 subdomains (bottom)
comment:1 Changed 7 years ago by nicolasmartin
comment:2 Changed 7 years ago by clevy
- Owner changed from nemo to rbourdal
comment:3 Changed 6 years ago by clevy
- Cc rbourdal added
- Status changed from new to assigned
comment:4 Changed 6 years ago by cbricaud
I tried to reproduce this bug with trunk rev 8583
I used AMM12 reference configuration ( bdy), switched it from gls to tke, and to UBS adv scheme for dynamics
I compared 4*8 and 8*4 for MPI splitting, then 10*12 and 12*10
The configuration is reproductible for these tests and the "strange" paterns doesn't appear
comment:5 Changed 5 years ago by gsamson
- Resolution set to wontfix
- Severity set to minor
- Status changed from assigned to closed
As Clément Bricaud did not succeed in reproducing Julien bug with AMM12 and a newer revision of the trunk (r8583 vs r6980), I consider either that the bug was fixed somewhere between the 2 revisions, either that we don't have enough elements from Julien configuration to reproduce the bug. So I close the ticket.
meridional surface velocity after a few days of simulation