TELEMAC-MASCARET Forum: Wetland simulation (very slow flow), no convergence at a steady-state (3/3)

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TOPIC: Wetland simulation (very slow flow), no convergence at a steady-state

Wetland simulation (very slow flow), no convergence at a steady-state 5 years 6 months ago #34472

Eleonora	I’m trying your .cas on not flat bathymetry..... it is running but from partial results it seems mass conservation is not achieved (Command prompt shows Qout=42 L/s when Qin is 25 L/s) I’ll try FV. I’m using version v7p2. With respect to the actual .cas, do you know what it is not included in FV? Thanks Jacques!
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Wetland simulation (very slow flow), no convergence at a steady-state 5 years 6 months ago #34477

JacquesFontaine OFFLINE Moderator Posts: 65 Thank you received: 18	Dear Eleonora, With non flat bathy, the case is longer to converge to Qin = Qout. So, you should increase duration time. In addition, to be mass conservative, it is not a good idea to "clip H". In your case with non-flat bathy, you probably clip a lot with these options: H CLIPPING = YES MINIMUM VALUE OF DEPTH = 0.0001 Best regards, J
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Wetland simulation (very slow flow), no convergence at a steady-state 5 years 6 months ago #34639

Eleonora

Hi Jacques,
finally I had the simulaton running properly. It seemed that the clipping option was the main problem for the mass conservation.
Thanks for your suggestions!

I'd like to ask something more, about friction laws. Or is it better to open a new topic, focusing on this?
My questions are:
- havig mostly laminar/transitional flows because of low velocities, which could be the right fiction law to use?
- or, is it possible to use user's defined bed shear stresses depending on Reynolds number? So variable in space (and also in time, until the steady state is reached).

Thanks. Eleonora

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