TELEMAC-MASCARET Forum: Modeling of a scum baffle (cloison siphoïde) (1/1)

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TOPIC: Modeling of a scum baffle (cloison siphoïde)

Modeling of a scum baffle (cloison siphoïde) 2 years 4 months ago #40568

Florent OFFLINE Fresh Boarder Posts: 9 Thank you received: 1	Hello, I am looking to model a scum baffle (cloison siphoïde) on telemac 3D. It is a concrete deck on piles. I don't know how to do. I was thinking of defining the piles as a solid border And defining the deck with several nodes, in line, on which I would assign (follow the level) zero velocity or not . Can anyone help me on this ? Best regards Florent Attachments: Capture.jpg (20KB)
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Modeling of a scum baffle (cloison siphoïde) 2 years 4 months ago #40605

pham OFFLINE Administrator Posts: 1559 Thank you received: 602	Hello Florent, Perhaps you could try to use the culvert feature available for TELEMAC-3D. Please read the TELEMAC-3D theory guide + TELEMAC-3D user manual + examples culvert and bergenmeersen (and the description of these 2 examples in the TELEMAC-3D validation manual). Hope this helps, Chi-Tuan
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Modeling of a scum baffle (cloison siphoïde) 2 years 4 months ago #40608

pilou1253
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Posts: 584
Thank you received: 106

Hello!

I have already done that in several projects. The method I use (that was suggested by JM Hervouet here on the forum around 2014 I believe) is:
- model the piles are holes in the mesh
- model the submerged slab by applying a local increased atmospheric pressure to force your water surface to be lowered down to the depth corresponding to the submergence.

You can find an example in this paper from the 2017 TUC:
henry.baw.de/bitstream/handle/20.500.119...quence=1&isAllowed=y

In this other paper there are even other methods explained that can be useful when modelling complex structures in 3D. For example, applying head losses to model obstacles is often a good compromise.
henry.baw.de/bitstream/handle/20.500.119...quence=1&isAllowed=y

Please keep in mind that all of this lies at the limit of what is reasonable to do with TELEMAC-3D. If you think the results are too rough, then you need to go CFD. A possible limitation to the incerased atmospheric pressure method is actual flow velocities. My applications are in harbors where flow velocities are < 0,5 m/s. If you need to have > 2 m/s, it might not behave as you wish.

As for culverts, I would not use this function as it is a node-to-node solution, hence not allowing you to obtain a good geometrical (and possibly hydraulic) detail level.

Hope it helps!

Best regards
PL

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