[Gmsh] problem with surface creation

[Christophe Geuzaine]

> On 2 Jul 2019, at 11:05, Alessandro Vicini <alessandro.vicini at sitael.com> wrote:
> 
>  
>  
> With reference to the attached geo file, I’m trying to generate some conical surfaces using “surface filling”, for example for the surface bounded by circles 22 and 21; but I get the message “OpenCascade surface filling requires a single line loop”…

You can use an OpenCASCADE "ThruSection" for that. In your case:

Curve Loop(1001) = 21;
Curve Loop(1002) = 22;
a() = Ruled ThruSections{1002,1001};

 
> If I switch to the built-in geometry kernel (which I would like to avoid), I get another kind of error message (1 border instead of 3 or 4).
> How can I work this out…? Thank you.

Nothing in the built-in kernel can do that: you'd need to subdivide the surface in 2 parts.

Christophe

>  
> Alessandro
>  
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— 
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science 
http://www.montefiore.ulg.ac.be/~geuzaine