dolfin team mailing list archive

[Jehanzeb Hameed <jhameed2@xxxxxxxxxxxx>]

I am still struggling with this....

I am trying to store subdomain identifiers in meshdata object, so that
they get updated when the mesh is refined. To do this, I have a file,
mesh.xml. In that file, there is a tag named "data". The "data" tag
has a child "array" with name = "material indicators". So, now when I
create mesh, will my meshdata have this array?

And how do I create cell dependent functions. The example in Dolfin
user manual seems outdated. I think I need to use UFCfunction, but
what do I pass as Function arguement to its constructor (if
UFCfunction is indeed the correct way to go).

-Jehanzeb

On Thu, Jun 11, 2009 at 11:55 AM, Bartosz Sawicki<sawickib@xxxxxxxxxxxxx> wrote:
> Jehanzeb Hameed wrote:
>>
>> Hello,
>>
>> I am new to Dolfin, and was wondering how subdomains are supported as
>> regards to mesh reading and refinement. In my case, I will have a
>> mesh, with 2 subdomains. Each cell has an identifier indicating which
>> domain it belongs to. Looking at the examples, it seems I will need to
>> store domain identifiers in a separate xml file. Is that correct?
>
> Subdomain identifiers can be stored in different ways, as a separate
> MeshFunction, or in the MeshData structure.
> I prefer MeshData, because it is directly included in the Mesh object.
> You can also store boundary indicators using MeshData structure, see
> demo/pde/bcs.
>
>> With regard to mesh refinement, I assume I will be able to define
>> subdomains for each domain based on cell identifiers. Now, when I
>> refine the mesh, will the subdomains also be updated (i.e. will dolfin
>> know what domain the new cells belong to) ?
>
> If you name your MeshFunction "material indicators" it will be transformed
> to follow refined mesh. Arrays which store boundary indicators will be
> updated too.
> See LocalMeshRefinement::transformMeshData()
>
>> Also, is there a way to read archives of this list?
>
> Yes, there is http://www.fenics.org/pipermail/dolfin-dev/
>
> regrds.
> BArtek
>
>
>>
>> Thanks,
>> -Jehanzeb
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>
>