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Hello,

I tried to run a model with telemac-2d and gaia, but the flows enter the model by the upstream liquid barrier. I have an imposed flowrate at the downstream barrier and an imposed elevation (free surface) at the upstream barrier. But when i look at the result of the simulation, I can see that the water enters upstream (the barrier with an imposed elevation).

Thanks for your help !

Mélissa

Hi

Could you explain what you are trying to simulate?
What is for you a "liquid barrier" as this look likes a boundary.

Imposed elevation upstream and impose discharge downstream is a quite strange configuration for an hydraulic computation...

Hello,

I am sorry for the misunderstanding, I switched the words upstream ans downstream, Indeed i want the flow to under upstream (like in rivers) but it enters downstream, so yes as you said the upstream is a liquid boundary with prescribed discharge and the downstream is a liquid boundary with prescribed élévation. Sorry for that. I try to simulate flooding to analyse bed shear stress.

Hope it's better understandable

If water enter downstream, this probably means the initial condition is lower than the impose level...

Thanks for the answer,
You mean that the "prescribed elevation" should be higher than the elevation imposed downstream by the stage discharge curve ? Because it is already the case
Or that the level generated by the previous computation file at a steady state should be higher than the level of the computation (defined by the stage discharge curve) ?

I just mean if at t0, the prescribed water level at the boundary is higher than the water level, then there is an entering flow at this boundary!