open TELEMAC-MASCARET The mathematically superior suite of solvers

Good morning,

I use Postel-3d for vertical cross sections views but I find triangles rather than quadrangles on the wireframe rendering. Please find attached insights with paraview : the top view shows the T3D result and the below view shows the Postel-3D result.

To date, I don't know how to apply distortion operation directly in paraview and asked to their support team if it is possible. In the mean while, is there a way I get quadrangles on my postel cross sections ?

My current study actually concerns a 3D domain that is very shallow (about 140 km x 40 km x 70 m) ; and I used the OV user subroutine with C = -2e4 m for this request.

Please find also attached the postel folder with the files I used for this request.

Best regards,
Audrey

Hi
The cut of quadrangles to 2 triangles is done in order to generate a selafin file.
As far as I know, it's not possible to have quadrangles in selafin format...
Long time ago there was another format (Leonard) for mesh with quadrangles which could be postprocessed with an old software (Rubens) of the Telemac system. As this software was removed, the format was also removed...

By the way, this is just a post processing change, the node values are not impacted...

Hope this helps

Alright thank you.
Triangles in the view don't disturb me actually but apparently worry my audience so I do my best to remove them.
Thank you so much for highlighting it helps a lot.

Hello Audrey,

In paraview, you can do distorsion with filter "Warp by Scalar" selecting e.g. ELEVATION Z as Scalars and a Scale Factor different from 100.

Christophe is right, what is important is the nodes values. Anything else is only post-processing or a way to visualise a triangular mesh (quadrangles cut into 2 triangles).

@Christophe, I think writing quadrangles in SERAFIN format may be possible if playing with NDP and IKLE parameters (number of points per element and the connectivity array) but I have not done it myself.
I wonder if spectra files for TOMAWAC are not written in quadrangles in SERAFIN format, but it seems when looking at fom_ang.spe file in angular_spread example.

Hope this helps,

Chi-Tuan

Hello Chi-Tuan

Thank you so so so so much !
The tip on paraview works perfectly !
Wonderful !

If ever I use postel results, can I comfort my audience by saying that we work on finite elements and not on volume ones ... and that the edges we see in the mesh rendering are not concerned by any quantities projections : is that right to say this to explain that only nodes count ?

Audrey

Hello Audrey,

You can say that for vertical cross section is made of interpolated points (which do not generally even correspond to 3D nodes) interpolation between the 3D fluid domain limited by the boundary conditions and the vertical cross section.
The segments represented in the vertical cross section is only here because a mesh is required to save results in SERAFIN format.

I must admit that having quadrangles in the vertical cross section mesh may be less disturbing.

Hope this helps,

Chi-Tuan

Hello Chi-Tuan,

Your explanation do helps a lot and will be forwarded.

Thanks again,
Audrey