Dear Riku,
this is not (yet) supported by deal.II. You will have to attach manually a
CylindricalManifold after extrusion. The library does not know yet how to
compute the extrusion of a general manifold object, therefore it removes all
manifold objects from the extruded triangulation (as they would not be valid
objects, being of type Manifold<2>, while you’d require a Manifold<3> object).
L.
> On 20 Sep 2018, at 20:24, Riku Suzuki <rikusuzuki.to...@gmail.com> wrote:
>
> Hi all
>
> I've been using the following chunk of code to generate mesh for 2D disk or
> 3D sphere:
>
> template <int dim>
> void sphere(Triangulation<dim> &tria,
> const Point<dim> ¢er,
> double radius)
> {
> SphericalManifold<dim> spherical_manifold(center);
> TransfiniteInterpolationManifold<dim> inner_manifold;
> GridGenerator::hyper_ball(tria, center, radius);
> tria.set_all_manifold_ids(1);
> tria.set_all_manifold_ids_on_boundary(0);
> tria.set_manifold(0, spherical_manifold);
> inner_manifold.initialize(tria);
> tria.set_manifold(1, inner_manifold);
> }
>
> The attached file p1.png shows a nice mesh in 2D generated from it (after
> refinement).
>
> Now I am trying to extrude the 2D mesh to get a 3D cylinder using
> extrude_triangulation as follows:
>
> void cylinder(Triangulation<3> &tria,
> const double radius,
> const double length)
> {
> Triangulation<2> tria2d;
> Point<2> center(0, 0);
> sphere(tria2d, center, radius);
> GridGenerator::extrude_triangulation(tria2d, 10, length, tria);
> }
>
> However the SphericalManifold is gone after extrusion, resulting in a mesh
> shown in p2.png.
>
> What did I do wrong?
>
> Thank you
> Riku
>
>
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> <p1.png><p2.png>
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