create reference simplex in 2d (triangle) based on three vertices

[Mathieu]

Hello everyone,

I read the simplex support documentation and was wondering 

whether it is possible to create a triangle in 2d based on three vertices?

The quadrilateral pendant is GridGenerator::general_cell().

Contrary to what one might think, GridGenerator::simplex()

transforms the reference simplex into three quadrilaterals,

which is also not what I am looking for.

So is there a way to create a mesh consisting of one triangle (using three vertices)?

I have deal.II 9.3.2 installed, but can upgrade if necessary.

Thank you,

Math

[Daniel Arndt]

Mathieu,

You should be able to use GridGenerator::reference_cell (https://www.dealii.org/current/doxygen/deal.II/namespaceGridGenerator.html#aeb9a83e353f8d69ce49ebdd191a3a51f),

and then move the vertices to your liking, e.g. by using GridTools::transform (https://www.dealii.org/current/doxygen/deal.II/namespaceGridTools.html#a212e99cf0d923cebfa04f1d23fa60b04).

Best,

Daniel

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[Mathieu]

Thank you Daniel!

I have one follow-up (I apologize for this basic question):

-The ReferenceCall that I have to pass to GridGenerator::reference_cell

only has a default constructor.

So how can I create a simplex using this constructor?

Best,

Math

[Daniel Arndt]

Math,

You can use ReferenceCells::get_simplex() https://www.dealii.org/current/doxygen/deal.II/namespaceReferenceCells.html#ace7fb0fa0c1a98b17ae9c6f6d2eaa650

to create a ReferenceCell object describing the reference simplex.

Best,

Daniel

To view this discussion on the web visit https://groups.google.com/d/msgid/dealii/4e354772-377b-47bb-a9b7-eee733b957dbn%40googlegroups.com.