On 10/15/2017 12:41 PM, Mark Ma wrote:
Now the projection of initial values (rewrite the code by manually assemble
the matrix and system_rhs and calculate) run OK, but the time updating of T is
not correct, same phenomenon appears. I believe this may arise from the fact
that direct using matrix vmult (i.e.
|
mass_matrix_T.vmult (system_rhs,old_solution_T_cal);
|
) instead of assembling and distribute_local_to_global again may ignore
eliminating the constraint points in matrix or vector, when using
constriantMatrix and interporate_boundary_values to apply the boundary
condition, I am now checking of this.
So when you visualize the solution, the error is at the boundary but it looks
correct in the interior?
Is there a simple way to update the RHS of old value using something simple
like vmult?
What is the equation you are trying to implement?
Best
W.
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Wolfgang Bangerth email: bange...@colostate.edu
www: http://www.math.colostate.edu/~bangerth/
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