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I am trying to model a river with various training structures. The width of the river is about 300m and the width of the training walls is less than a meter. Is there a way that we can turn off the u,v calculations for a specific element or do I have to simulate this by generating islands?

Edwin

Hello,

Yes of course, you can use MASKEL, which is an array the work on the elements. The obvious subroutine to use is MASKOB where you can just set the value of MASKEL(IELEM) to 0 for those elements you wish to take out of your simulation.

Hope this helps.

Sébastien.

Hi Sébastien,

Thank you for the help.

Edwin

Hello,

I am also trying to implement thin structures in a mesh (e.g. a setback dike on a wide and flat floodplain). I'd like to avoid having to generate very small elements around the structure and I think that would be required if the structure was modelled as an island or by masking out elements.

Ideally, I would like to be able to specify node numbers to identify line segments corresponding to the structure location and then ensure that no water flows across those line segments.

Is this possible in TELEMAC2D? Any suggestions would be greatly appreciated. Thanks!

Hello,

In your case you can have an island. Even if the island is a thin structure, elements around need not be so thin (in Telemac-2D or 3D).
As for masking elements, we would like to remove this possibillity in the future, it raises difficulties for some algorithms and we think that masking elements should be replaced by cleanly removing them from the mesh.

With best regards,

Jean-Michel Hervouet

Jean-Michel Hervoue,

You mentioned that the elements around a small island need not to be so thin. How do you go about creating an 50 m wide x 2000 m long island in a mesh with element length of about 500 m without reducing the element size around island?

Edwin

This is not ideal indeed -- If you can live with the following points defining your island, here is an example done with Blue Kenue (triangulating first the island itself and using it as a submesh, cutting it out after ... Martin can explain the rest ...

Hope this helps.

Sebastien.

Thanks. I will give that a try.