TELEMAC-MASCARET Forum :: Topic: Culvert Lenght limitation (1/1)

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TOPIC: Culvert Lenght limitation

Culvert Lenght limitation 5 months 4 weeks ago #43630

Diegob OFFLINE Fresh Boarder Posts: 3	Hi everyone, Is there a lenght limitation for the hydrodynamic Simulation of Culverts ? Thank you in advance
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Culvert Lenght limitation 5 months 4 weeks ago #43631

nicogodet NOW ONLINE Senior Boarder Posts: 128 Thank you received: 31	No length limitation. Length is only used to compute linear losses. Check chapter 1.7 in TELEMAC3D Theory Guide (valid for culvert in TELEMAC2D).
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Culvert Lenght limitation 5 months 4 weeks ago #43632

c.coulet OFFLINE Moderator Posts: 3632 Thank you received: 1010	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...
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Culvert Lenght limitation 5 months 3 weeks ago #43649

Diegob
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Posts: 3

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

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Culvert Lenght limitation 5 months 3 weeks ago #43650

c.coulet
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Thank you received: 1010

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

Christophe

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