How And Where Does Mfem Distinguish CG Vs DG In Terms Of DOF

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Jump to bottom How and where does mfem distinguish CG vs DG in terms of DOF #1145 Closed geyan3566 opened this issue Nov 5, 2019 · 2 comments Closed How and where does mfem distinguish CG vs DG in terms of DOF #1145 geyan3566 opened this issue Nov 5, 2019 · 2 comments Assignees Labels fem usage

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geyan3566 commented Nov 5, 2019

Hi, I'm constructing another discontinuous finite element collection other than L2_FECollection. I followed example 9, but I couldn't get where and how MFEM introduces the extra degrees of freedom on the element interfaces? Does it start at mesh construction or finite element space construction? Thanks, Ge

All reactions tzanio self-assigned this Nov 6, 2019 tzanio added fem usage labels Nov 6, 2019 Copy link Member

tzanio commented Nov 6, 2019

It is part of the finite element space, and specifically the finite element collection. Specifically, FiniteElementSpace::Construct() calls FiniteElementCollection::DofForGeometry with the various geometric entities (Geometry::POINT, Geometry::SEGMENT, etc.) to figure out how many degrees of freedom are associated with each geometric entities. For the L2_FECollection, no dofs associated with shared entities are returned.

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geyan3566 commented Nov 6, 2019

It is part of the finite element space, and specifically the finite element collection. Specifically, FiniteElementSpace::Construct() calls FiniteElementCollection::DofForGeometry with the various geometric entities (Geometry::POINT, Geometry::SEGMENT, etc.) to figure out how many degrees of freedom are associated with each geometric entities. For the L2_FECollection, no dofs associated with shared entities are returned. Thanks for your reply. It solved my problem.

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