[Gmsh] Extruding a circle into a cylinder

[Sacconi, Andrea]

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.sacconi11 at imperial.ac.uk