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Hi everyone,
Is there a lenght limitation for the hydrodynamic Simulation of Culverts ?
Thank you in advance

No length limitation.
Length is only used to compute linear losses.

Check chapter 1.7 in TELEMAC3D Theory Guide (valid for culvert in TELEMAC2D).

In fact, there is a kind of implementation of length limitation because there is no lag between input and output discharge.
The transfert is always considered as instantaneous...

Thanks a lot for your reply. I would have one more question in this regard. As far as I understood, from other posts, the culvert discharge is however limited by the cell size. For example, if I had a circular Culvert with a diameter of 2.5 m in a mesh with an element size of 50 cm, the calculation of the discharge would not be correct unless the culvert is divided into two or three, correct ?

Kind regards and thanks in advance

Diego

Once again, this could be a limitation or not...
The culverts, in the basic description is a structure smaller than the mesh which as a local incidence but which is not the interesting part of the study. To avoid problem of numerical instabilities, there is a limitation in the computation of the discharge given by the water volume of the cells surrounding the entry node. You cannot obtain a discharge which on the computation time step gives a greater volume than the available water volume.
In the described case, if the computed discharge is low (due to upstream and downstream condition), having a culvert of 2.5m with 0.5m cell size will not be a problem...
Hope this helps