On 04/15/2018 07:34 PM, Jaekwang Kim wrote:

Is there any example tutorial related to the first approach?

_/"You can build a ConstraintMatrix object that sets boundary DoFs of V to the
corresponding values of U. This should be easy to do." /_

None that I would know of, but you build constraint matrices by calling
  constraints.add_line (i);
  constraints.set_inhomogeneity(i, xi);
if you want to constraint degree of freedom 'i' to value 'xi'.

In your case, 'i' are all of the DoFs located at the boundary, and xi is the value you need to set the DoF to.


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

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