[MITgcm-support] IEEE_INVALID_FLAG and IEEE_OVERFLOW_FLAG

[Yangxin He]

Hey,


I am sending a mode-one oceanic IW from the left boundary using obcs, and there is a sponge layer on the right boundary.


If I set delta x to be 300m, it runs alright. But I want better resolution, so I set delta x to be 200m. Now no matter what deltaT it is, for example, I tried deltaT ranging from 0.5 to 100, it gives me the message,


"Note: The following floating-point exceptions are signalling: IEEE_INVALID_FLAG IEEE_OVERFLOW_FLAG

STOP NORMAL END".


And my output files are filled up with NaNs.

I also checked my stdout file to see the CFL condition,

"

(PID.TID 0000.0001) %MON trAdv_CFL_u_max              =   1.5873708813573E-02

(PID.TID 0000.0001) %MON trAdv_CFL_v_max              =   0.0000000000000E+00

(PID.TID 0000.0001) %MON trAdv_CFL_w_max              =   0.0000000000000E+00

(PID.TID 0000.0001) %MON advcfl_uvel_max              =   1.6143191354999E-02

(PID.TID 0000.0001) %MON advcfl_vvel_max              =   0.0000000000000E+00

(PID.TID 0000.0001) %MON advcfl_wvel_max              =   0.0000000000000E+00

(PID.TID 0000.0001) %MON advcfl_W_hf_max              =   0.0000000000000E+00

"

So it seems the CFL condition is fine?

Part of my data file is as the following:

"

# Time stepping parameters

 &PARM03

 nIter0=0,

 nTimeSteps=500,

 deltaT=10.,

 abEps=0.1,

 pChkptFreq=0.,

 chkptFreq=0.,

 dumpFreq=50000.,

 monitorFreq=2500.,

 monitorSelect=2,

 &


# Gridding parameters

 &PARM04

 usingCartesianGrid=.TRUE.,

 delX=200*200.,

 delY=5.E3,

 delZ=40*5.,

&

"

What can be the problem? How can I fix it?


Thanks

Yangxin
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