On 10/10/2017 08:40 AM, Mark Ma wrote:
I want to solve a heat equation in the time domain with distributed memory
using MPI, but the results are incorrect. In order to do so, I reference
tutorial step-23 for time updating method and step-40 for implementing MPI.
May I ask whether my boundary condition is right or not? Should we do
compress() after apply_boundary_values()? Thanks in advance!
Jack -- how exactly is your solution wrong when you look at it? Do the
boundary values look wrong? Are they correct if you run your MPI program with
just one MPI process?
In general, using MatrixTools::apply_boundary_values() is not the way to go
with MPI programs. Rather, use a ConstraintMatrix and incorporate the boundary
values into the same object as you do with hanging node constraints. That's
what all of the parallel programs do, if I recall correctly.
Best
W.
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Wolfgang Bangerth email: [email protected]
www: http://www.math.colostate.edu/~bangerth/
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