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Model Crashes when coupled with Sisyphe after 375192 steps
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TOPIC: Model Crashes when coupled with Sisyphe after 375192 steps

Model Crashes when coupled with Sisyphe after 375192 steps 11 years 1 month ago #10586

  • qilong
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Hello,

Recently I'm testing my 3D sediment transport model (Telemac3D coupled with SISYPHE). But the strange thing happned after 375192 steps.

I loaded the result file in BlueKenue, all the variables such as suspension concentration, bed shear stress, velocity as well as Salinity and Chezy Coeff. suddenly go wrong at 21D 17:10:00. All the values become -1#IND.

I set the DEBUGGER to 1 so I get the error
APPEL DE CVDF3D POUR U                                                                                                                               
 RETOUR DE CVDF3D POUR U                                                                                                                              
 APPEL DE CVDF3D POUR V                                                                                                                               
 RETOUR DE CVDF3D POUR V                                                                                                                              
 APPEL DE CVDF3D POUR W                                                                                                                               
 GRACJG (BIEF) : EXCEEDING MAXIMUM ITERATIONS:     101 RELATIVE PRECISION:             NaN                                                            
 APPEL DE WAVE_EQUATION                                                                                                                               
 RETOUR DE WAVE_EQUATION

It happens in the subroutine CVDF3D when it solves velocity component W.
I guess it may be caused by the thickness of the bed layer. Maybe vertical distance at some nodes become zero? I'm struggling with this problem and can't find the reason.

Any help will be appreciated!

Kind regards,
Qilong
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Model Crashes when coupled with Sisyphe after 375192 steps 11 years 1 month ago #10587

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This problem doesn't happen if I just run Telamc3D without Sisyphe coupled. So the reason may be that Sisyphe modified the bottom elevation and created zero vertical distance. But this is just my guess...
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Model Crashes when coupled with Sisyphe after 375192 steps 11 years 1 month ago #10588

  • jmhervouet
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Hello,

Difficult to say what happens. Is it in parallel ? One thing to try would be to do a restart shortly before the crash, so that it crashes more rapidly. But the real thing to do is to test with all checkings in the compiler, so that you get the subroutine and the line where it crashes. For example with Intel compiler it is :

-debug all -check all -traceback -ftrapuv

It is not recommended to do this all the time (there is an important slow down, sometimes a factor 4) but it is very efficient to find a problem.

Regards,

JMH
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Model Crashes when coupled with Sisyphe after 375192 steps 11 years 1 month ago #10589

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Thanks for your advice!
I'll do a restart and try to identify the line where it gives the problem.
I'll keep you updated.

Kind regards,
Qilong
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Model Crashes when coupled with Sisyphe after 375192 steps 11 years 1 month ago #10590

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Sorry to ask again. I know there is a restart model in Telemac3D but this restart model doesn't exist in Sisyphe (I didn't find the keyword restart in Sisyphe dictionary file). How can I use the restart model in a coupled model?

Kind regards,
Qilong
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Model Crashes when coupled with Sisyphe after 375192 steps 11 years 1 month ago #10591

  • jmhervouet
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Hello,

Well normally there is a restart in Sisyphe (computation continued = YES) and you should restart both programmes, though I am not sure that there is a test case exempliying this.

Regards,

JMH
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Model Crashes when coupled with Sisyphe after 375192 steps 11 years 3 weeks ago #10805

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Hello Jean-michel,

Sorry to bother you again. After a lot of testing, I finally get the case that has the same problem as mentioned in this thread before but this time it crashes at the first time step. The problem is occurred in the subroutine CVDF3D for the vertical velocity component.

The error says
APPEL DE CVDF3D POUR U                                                                                                                               
RETOUR DE CVDF3D POUR U                                                                                                                              
APPEL DE CVDF3D POUR V                                                                                                                               
RETOUR DE CVDF3D POUR V                                                                                                                              
APPEL DE CVDF3D POUR W                                                                                                                               
GRACJG (BIEF) : EXCEEDING MAXIMUM ITERATIONS:     101 RELATIVE PRECISION:             NaN                                                            
APPEL DE WAVE_EQUATION                                                                                                                               
RETOUR DE WAVE_EQUATION

The model is coupled with Sisyphe. Could you help me to debug this model?
Thanks in advance.

Qilong
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Model Crashes when coupled with Sisyphe after 375192 steps 11 years 3 weeks ago #10818

  • jmhervouet
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Hello Qilong,

Excellent, so we would need to have your files now, to test your case and see what happens.

With best regards,

Jean-Michel Hervouet
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Model Crashes when coupled with Sisyphe after 375192 steps 11 years 3 weeks ago #10820

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Thanks Jean-Michel!

I've already have the test case prepared. Here is the link for download the test model.

skydrive.live.com/redir?resid=B91E944B1B...key=!AMpO5IUcgKprbH8

Best Regards,
Qilong
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Model Crashes when coupled with Sisyphe after 375192 steps 11 years 3 weeks ago #10849

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Hello Jean-Michel,

I used the method you mentioned before to debug my model. And indeed it tells me which line gives problems in the debug model. Finally I identified the problem which is that there is a uninitialized variable in my modifications (subroutine CORSTR and TFOND). After initialization of that variable, the Telemac-3D has no problem when coupling with SISYPHE.

Thanks for your advice!

Best regards,
Qilong
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