Strong DG likely cannot handle unstructured grids which may have flipped, rotated, or oriented faces.

dougshidong / PHiLiP

Parallel High-Order Library for PDEs through hp-adaptive Discontinuous Galerkin methods

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Strong DG likely cannot handle unstructured grids which may have flipped, rotated, or oriented faces. #251

Open dougshidong opened 11 months ago

dougshidong commented 11 months ago

Discovery while investigating: https://github.com/dougshidong/PHiLiP/issues/249

Weak DG uses deal.II to obtain correct face projections: https://github.com/dougshidong/PHiLiP/blob/a29ecce53f33a3f0bafc14ef8db767fe967e29b8/src/dg/weak_dg.cpp#L1468-L1501

However strong DG does not and will likely fail for unstructured grids. Attaching a Gmsh grid (had to change suffix from .msh to .log, please change it back before reading into PHiLiP) that could be used to test.

naca0012.log

AlexanderCicchino commented 11 months ago

https://www.dealii.org/developer/doxygen/deal.II/structGeometryInfo.html#a41eabdf96722189263e5ede8ab8d566a Attached this here for reference on the the line/face numering would get changed for each condition.

AlexanderCicchino commented 9 months ago

naca0012.log As an update: there is an error within gmsh reader when using this mesh.