open TELEMAC-MASCARET The mathematically superior suite of solvers

Hello,

I'm a Master studend and I've been using T2D for a few months.

I am studying the effect that the construction of a weir has on scouring. Until now, I have been using T2D (using BK to generate the mesh, and Fudaa as a preprocessor). I am quite happy with the result I obtained from the 2D so I decided to see what happens when performing a 3D simulation.

I read in the forum that I must used the same grid I have been using until now. I have tried to use Fudaa to define the simulation parameters however, I am not able to see the geometry file once I choose to start a new T3D project. I want to see the geometry in order to define the boundary conditions and I also have to define the weir.

Could anyone help me to deal with the weir definition? Should I use the same boundary condition file I was using in my 2D simulation?

Thank you very much.

Hello,

Yes, to start with, the geometry and boundary conditions file are the same, and the boundary conditions are duplicated on the vertical.

With best regards,

Jean-Michel Hervouet

Hello,

Thank you very much for your answer.

I managed to run a simulation using the same boundary conditions file I used with the T2D.

In order to deal with the weir structure I am also the "Formated Data File 1" from T2D too. Is that right? It seems that there is something wrong.

Another thing I am facing is that I have to use shorter time step intervals compared to the 1s interval I used in 2D...

Again, thanks a lot.

Hello,

Actually there is no weir option in Telemac-3D, basically because you can model it with the bottom topography. In 2D we designed a weir option because the discharge over weirs given by shallow water equations is slightly wrong (it neglects vertical accelerations).

With best regards,

Jean-Michel Hervouet

Hello,

Thanks for your advice.

However the problem I am facing is that the weir I have to model is divided in 2 parts. One part of the weir is fixed while the other is movable.

The main problem comes out when modelling the underflow when the gates of the movable part of the weir are opened.

My idea, was to implement this underflow in the T2D using culverts. Even I can not model the underflow perfectly I think that the culverts offer me an approach closer to the real phenomena. This is the only possible solution I could figure out.

However usintg T3D, if I modify the bottom topography I will just be able to model the overflow scenario. Would there be any way of dealing this underflow using T3D?

Thanks in advance.

Carlos