open TELEMAC-MASCARET The mathematically superior suite of solvers

Hello everyone,

This is second time that I pose same question (sorry for that).
I want to run a 2D Telemac model for a big catchment in which topo varies a lot (from -15m to 65m), so for such a big domain I can not use any of 5 suggested possibilities as initial condition, instead I did an interpolation of free surface in BleuKenue and I am using it as a PREVIOUS COMPUTATION FILE (in .slf format, using the FREE SURFACE as variable), but still I get the boundary condition eror(attached pic).

Thanks for your helps.

Regards.

As told by the error message, your boundary #2 may have supercritical flow. Try to add tiny water depth for the nodes along boundary #2 in your previous computation file.

Hailiang

Whenever I decrease the water depth the problem is getting worse, but when I increase it by a large value (which is not realistic), then it works. Don't know why.

regards.

It may be then related to the longitudinal slope of boundary #2. Do you see large slope there? If so I would suggest 1) smooth it by editing the node elevation, or 2) move this boundary to a location with smoother slope by remeshing your study area.

Hailiang

Thank you for reply,

I don't see large slope there, but still I will modefy a bit.

1- I want to know that is the way I made the PREVIOUS COMPUTATION FILE ok?
I did it as follow:
I have transvers profile of the channel(.XYZ format), then I interpolated them over the channel and saved it as a selfin file, and in selafin file I have used FREE SURFACE as variable.

2- My second question is:
Does Telemac stops calculation when the flow gets supercritical?

Regards and Thank you so much

Hello

The error message could mean simply that the boundary #2 is getting dry. During the computation, you have to ensure that all liquid boudnaries with prescribed discharges are kept wet (this answers to your question of post 2)
In your case, verify if boundary 2 is getting dry during the computation or not.
reduce time step can help.

with my best regards

Riadh

Thank you so much for reply.