TELEMAC-MASCARET Forum: STOP IF A STEADY STATE IS REACHED in Telemac3d? (1/1)

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TOPIC: STOP IF A STEADY STATE IS REACHED in Telemac3d?

STOP IF A STEADY STATE IS REACHED in Telemac3d? 10 years 5 months ago #13307

716469 OFFLINE Expert Boarder Posts: 303 Thank you received: 6	Dear Users, I have a quick question. There is an option in Telemac2d as STOP IF A STEADY STATE IS REACHED. Is there is anything similar to that can be used in Telemac3d? I am running a salinity/temperature simulation and would like to know if/and when it reaches the steady state. Thanks in advance. Kind Regards! Violeta
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STOP IF A STEADY STATE IS REACHED in Telemac3d? 10 years 5 months ago #13313

sebourban OFFLINE Administrator Principal Scientist Posts: 814 Thank you received: 219	Hello, Unfortunately not. We will add this to our TODO list and let you know when available. Sébastien.
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STOP IF A STEADY STATE IS REACHED in Telemac3d? 10 years 5 months ago #13350

716469 OFFLINE Expert Boarder Posts: 303 Thank you received: 6	Thank you very much Sebastien for your clarification. I will try to find a way to analyse it by using diffusion formula at various time shots. I have not done it yet, but somebody in office suggested it. Kind Regards! Violeta
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STOP IF A STEADY STATE IS REACHED in Telemac3d? 10 years 5 months ago #13382

jaj
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Posts: 69
Thank you received: 7

Dear Violeta & Sébastien,

we deal at BAW a lot with quasi-stationary flows in river stretches (BCs like inflow flux and outflow water level kept constant), i.e flows in which the overall picture and/or some variables reach an almost stationary state, but here or there oscillations (e.g. eddies) may occur.

I have written once a module (I think it was called, ehm, variat) to be called in the Fortran file which computed the norm of changes in required variables as a sum over all nodes (or maximum change...?) in the last n steps of the computation in order to have a statistically valid measure if the (quasi-)stationary state has been reached or not. (Other usual criteria are fluxes over given cuts along the river.)

Unfortunately I cannot find the code anymore, but maybe someone at BAW still has it. It would be easy to reprogram it to get sound stopping criteria.

Best regards,
jaj

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STOP IF A STEADY STATE IS REACHED in Telemac3d? 10 years 5 months ago #13383

716469 OFFLINE Expert Boarder Posts: 303 Thank you received: 6	Dear Jaj, Thank you very much for your reply. It would be great to have the tool like that! In a mean time, I just look at density difference in time, but to do it manually it is just a local pick, unfortunately my domain is huge. I hope by time I finish my PhD I could produce more accurate diffusion analysis with Telemac3d:). Thanks. Kind Regards! Violeta
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