[Gmsh] Extruding a circle into a cylinder

[johannes.wagner at gmail.com]

I have a short follow up question on this: Is it possible to get the 
cylinder walls as a Compound surface, i.e. not divided by the 4 lines that 
come from the <pi circle arc extrusions? Right I now don't have an idea how 
to do this...

Hope 

On Monday, September 9, 2013 at 5:33:12 PM UTC+2, Sacconi, Andrea wrote:
>
> Hi everybody, 
>
> I have a problem with the Extrude command. 
> I would like to create a cylindrical mesh, but I need to generate a mesh 
> only on the lateral surface of the cylinder. In other words, I don't want 
> any elements on the two circles, top and bottom. 
>
> I wrote this: 
>
> lc = 0.5; 
> Point(1) = {-1, 0, 0, lc}; 
> Point(2) = {0, -1, 0, lc}; 
> Point(3) = {1, 0, 0, lc}; 
> Point(4) = {0, 1, 0, lc}; 
> Point(5) = {0, 0, 0, lc}; 
> Circle(1) = {1, 5, 2}; 
> Circle(2) = {2, 5, 3}; 
> Circle(3) = {3, 5, 4}; 
> Circle(4) = {4, 5, 1}; 
> Line Loop(5) = {1, 2, 3, 4}; 
>
> geoExtrude[] = Extrude {0, 0, 1} { Line{5}; }; 
>
> but I don't get any extrusion. I see only the circle centred at (0, 0, 0) 
> with radius 1. 
> Is it possible to get the cylinder I need? How would you proceed? 
>
> Thanks in advance for your help! 
>
> Andrea 
>
> __________________________________________________________ 
>
> Andrea Sacconi 
> PhD student, Applied Mathematics 
> AMMP Section, Department of Mathematics, Imperial College London, 
> London SW7 2AZ, UK 
> a.sac... at imperial.ac.uk <javascript:> 
>
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> gm... at geuz.org <javascript:> 
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>
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