Hello all,
I want to calculate local flux matrix of a cell (in 2D). The algorithm I
thought of is the following:
[image: CodeCogsEqn.png]
Within loop over cells:
start loop over faces:
re-initialize fe_face_values for current face
calculate the 1D mass matrix
add contribution of this face to cell's flux matrix (how)
The 1D mass matrix on a face can be computed using fe_face_values. To get
the mapping between a face's mass matrix and cell's flux matrix, we require
to know what DoFs of a cell are on which face. The FE_DGQ class
<https://www.dealii.org/current/doxygen/deal.II/classFE__DGQ.html>
documents the ordering of DoFs. What is the ordering of the faces w.r.t. a
cell? i.e.; what DoFs of a cell do each of the faces 0,1,2 and 3 hold?
Thanks
Vachan
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