On 3/16/21 6:12 AM, Anton Ermakov wrote:
I attach the minimally changed Step-26 code to illustrate the problem. It is
different from the original step-26 in three important places:
1) in the run function, the mesh is refined in a corner
2) in the setup_system the mass and Laplace matrices are manually created.
3) Initial temperature field is set to 100 K and the boundary condition is
temperature fixed at 50 K. No source term.
I don't immediately see a problem. What happens if you use your matrices with
the exact set up of step-26? Simplify your problem: Make one change at a time,
not three.
If you do get different results, compare the matrix you compute with the one
computed by the MatrixTools functions. How are they different? And why?
Best
W.
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Wolfgang Bangerth email: bange...@colostate.edu
www: http://www.math.colostate.edu/~bangerth/
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