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Good morning all,

According to the manuals, Telemac3D is mainly to be used for "river and coast engineering studies".

I have some structures (e.g. Spillway) I would like to simulate. Is Telemac3D the right tool for the job, or should I use something else for that?

Hello,

It can be done if the geometry allows it (e.g. Creager spillways cannot be modeled with Telemac-3D due to their form upstream) and if you have no breaking of waves, but it is rather the limit of what we can do, this kind of applications is rather meant for Volume Of Fluid methods (VOF) or Smoothed Particle Hydrodynamics (SPH).

With best regards,

Jean-Michel Hervouet

Hello,

to complement Jean-Michel's answer and since we did some investigations in the past:
our experience here is that the applicability of Telemac-3D for the investigation of spillway capacity depends strongly on the shape of the weir.
If the weir sill at the upstream face has a large height compared to the weir head then Telemac-3D will not do a good job, see the enclosed picture.


By the way, in such a case Telemac-3D underestimates the pressure distribution along the weir sill considerably.

If the weir sill has only a moderate height, like a small bump, then Telemac-3D is suitable, like in this example:
http://www.opentelemac.org/index.php/kunena/11-gallery/444-spillway-with-stilling-basin
In this example the contraction losses due to the lateral abutment piers are the dominant factors for the overall head loss, therefore we got good results regarding the spillway capacity even with the depth-averaged model Telemac-2D.

Best regards,
Clemens

Thanks Jean-Michel and Clemens for your input on that issue. I will keep Clemens' findings in mind when setting up the model and choosing the simulation method.