opencascade and 2d problems

[Praveen C]

Dear all

I am trying to use opencascade for 2-d flow problems, e.g., flow over an airfoil. Learning from step-54, I created an iges file for rae2822 airfoil, a Q1 mesh in gmsh and I can now refine it. The code is here

https://bitbucket.org/cpraveen/deal_ii/src/master/occ/refine/?at=master

The files are in occ/rae2822.

This approach requires using Triangulation<dim,3> since occ works in 3d. If my problem is only in 2d (dim=2), is there a way to use occ without introducing a spacedim template everywhere in my code ? Can I set all the manifold info on a Triangulation<dim,3> object, then get a Triangulation<dim> from that, and use it in my code ?

Thanks

praveen

[Luca Heltai]

Dear Praveen,

If you do not intend to refine the grid afterwards, then you can use Gridtools::flatten to extract a flattened version of the triangulation, I.e., a two dimensional one after you have done all the refinement you need. 

Best,

Luca

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[Praveen C]

Dear Luca

Will the manifold info be available for high order mappings after doing flatten ?

Thanks

praveen

[luca.heltai]

No. You have to make all refinement on the <2,3> grid, and then flatten it. Alternatively, you can still use the 2,3 grid as if it was a two dimensional grid… nothing really changes, except the fact that gradients will be three dimensional instead of two dimensional, with third component equal to zero…

Best,

Luca.