TELEMAC-MASCARET Forum: mass balance and wrong DT (1/1)

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TOPIC: mass balance and wrong DT

mass balance and wrong DT 6 years 6 months ago #30081

mourad
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Posts: 155
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Dear telemac users,
I've done 9 runs using the keyword 'computation continued = true' with the help of the last record for each new run. The full run is too long (duration = O(10^10 * dt) and I'm thinking this make 'Surprinsgly' the Matlab routine telheader.m giving me a wrong DT from the run N°5 (3584 rather than 3600 seconds).
Doses any one knows how to deal with this.Is it only a bug in telheader.m ? these file are too big to handle them with bluekenue.
further the telemac log for the mass balance shows some stars (*******) for time in days and in seconds rather the real values, I guess this happen when these number are too long?
Any helps is welcome
Thank you in advance
Mourad

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mass balance and wrong DT 6 years 6 months ago #30114

Leballeur OFFLINE openTELEMAC Guru Posts: 434 Thank you received: 163	Hi Mourad, I think it's not a bug in telheadr, but rather a non correct results file. Are you sure your 5th simulation ended correctly? Can you read the following files (6 to 9)? Regards, Laurent
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mass balance and wrong DT 6 years 6 months ago #30222

mourad OFFLINE Expert Boarder Posts: 155 Thank you received: 6	Hi Laurent, Everything gone okay for the 6th and 7th simulation and this is the case for any run. How can telheadr display a DT=3584 rather than 3600, this is realy strange cause my dt is of 20 sec and the graphic period is 180, this means an iteration is stored every 3600 sec !
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mass balance and wrong DT 6 years 6 months ago #30247

Leballeur
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openTELEMAC Guru
Posts: 434
Thank you received: 163

Hi Mourad,

telheadr computes the time step DT from the first and the second time records. Can you check if these 2 values (T1 and T2) are correct ? especially T1 in the case of a restart simulation.
What does telheadr return for the other parameters of the file header ? number of time steps (NSTEPS), number of variables (NBV), number of nodes and elements (NPOIN/NELEM), starting date (IDATE)...

If you try displaying one of the result variables (water depth or velocities), are they correct for the first time step ?

Regards,
Laurent

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