dolfin team mailing list archive

["Johan Hoffman" <jhoffman@xxxxxxxxxx>]

> On Tue, Jun 16, 2009 at 09:12:02AM +0200, Johan Hoffman wrote:
>> > On 15/06/09 10:21 PM, Jehanzeb Hameed wrote:
>> >> Hello,
>> >>
>> >> Is there a function I can hook into LocalMeshRefinement (or
>> elsewhere)
>> >> which allows me to define the rule for edge-bisection? This would be
>> >> handy, e.g. if we knew our mesh was a sphere, then points on boundary
>> >> can be pushed off differently so that they always lie on the sphere.
>> >>
>> >>
>> > As far as I know Dolfin doesn't support any other description of solid
>> > different than just Mesh. This means that there is no way to follow
>> > shape of the boundary during refinement.
>> > This would be nice to have such feature, but I can't imagine
>> > implementing it without having advanced meshing core with support for
>> > CSG or something similar.
>> >
>> > If you really need a smooth sphere, I would just change the code of
>> > RivaraRefinement.cpp (see line 264, where new point is defined). For
>> > sphere is quite simple, to predict where the point should be located.
>> >
>> > cheers
>> > BArtek
>>
>> The simplified cases of cylinders and spheres are available today in
>> Unicorn:
>> http://www.fenics.org/wiki/Unicorn
>>
>> We are currently developing the general case of projection of the mesh
>> onto an exact geometry, where the exact geometry can be represented e.g.
>> as a NURBS surface, which I expect will be in place after the summer.
>
> Will this be in DOLFIN or in Unicorn?

This is currently developed as a separate library by our msc thesis
student Ashraful Kadir, I am not sure how this is best connected to
FEniSC. We will also consider an alternative approach based on closer
integration with Gmsh for the geometry.

/J

>
> --
> Anders
>
>
>> Also, different variants of local mesh refiement (such as the Rivara
>> algorithm) is available today in Unicorn, including a distributed
>> parallel
>> version using MPI.
>>
>> For a continuing discussion on Unicorn, there is a dedicated mailing
>> list:
>> unicorn-dev@xxxxxxxxxx
>>
>> All the best,
>> Johan
>>
>>
>>
>>
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