Boundary DOFs using DOF Handler

[Animesh Rastogi IIT Gandhinagar]

Hello All,

I have a quick question about the dof_handler in dealii. I have a rectangular geometry and would like to access the numbering of the degree of freedoms which are on the right hand side boundary of the rectangle (+X face). I know the boundary_id for that face. Essentially, I want to use that number to extract the x component of the displacement at that node using the displacement vector.

Thanks!

Animesh

[Wolfgang Bangerth]

You can get all DoF indices on a particular boundary via
DoFTools::extract_boundary_dofs(). You can correlate this
DoFTools::extract_dofs() with a component mask that corresponds to your
x-displacement. With the information produced by these two you should be able
to pick out which DoFs you want to work on.

Best
W.


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Wolfgang Bangerth email: bang...@colostate.edu
www: http://www.math.colostate.edu/~bangerth/

[Animesh Rastogi IIT Gandhinagar]

Thank you, Professor Bangerth. This is really helpful.

Animesh