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Hi everyone,

I have a problem when I want to merge two meshes with BlueKenue.

I create a large mesh with an island. To create the island, I use a Resampled Line as Hard Line. Then I obtain a mesh with solid boundary into.

After that, I would like to have a complete mesh with the same elements except in the island. So I created a new mesh with my Resampled Line (the same one) used as Outline.

Finally, I merge my to meshes to have a complete mesh. However, when I try to use my mesh with FUDAA, I have the error "Erreur lors de la génération de la frontière, l'indice XXXXX n'a pas de voisin" for all the nodes at the boundary of my island.

I saw in BlueKenue that my nodes don't have the same coordinates in my complete mesh and in my submesh at the boundary, even though I used the same Resampled Line as Outline and Hardline. Especially, when I used the line as Outline, all the values are rounded. For instance, my Resampled Line has X = 916843.269, my Hardline too, but my Outline has X = 916843.250.

How can I do to connect correctly my two meshes ?

Hi Arthur,

I'll give you one answer and one suggestion :

- You should work with local coordinates using xy shifting.
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- Your question suggest that you want to compare two simulation (with or without the island)... Did you know this interesting feature.

Element Masking

TELEMAC-2D offers the possibility of masking certain elements. This means, for example, that islands can be created in an existing mesh. The boundaries created in this way are processed as solid walls with a slip condition.

This option is activated with the logical keyword ELEMENTS MASKED BY USER (default value: NO). In this case, the user must indicate the number of elements masked by programming the MASKOB subroutine. This manages an array of real values MASKEL, the size of which is equal to the number of points and in which each value can be 0.D0 for a masked element and 1.D0 a normal one.

Thank you for your suggestion, it is exactly what I want to do, but I didn't know this feature in Telemac.

I'll also try the local coordinates,

Thank you again for your answers