Hi Jaekwang,
The error message is pointing you to the fact that when you call run() a
second time you end up trying to rebuild the triangulation on top of the
one that you have the first time run() was called. There are a few ways
that you can work around this. Here are two suggestions:
1. Create a new instance of the laplace_problem each time you change the
boundary value
{
bvalue = 1;
Step4<2> laplace_problem_2d;
laplace_problem_2d.run ();
}
{
bvalue = 2;
Step4<2> laplace_problem_2d;
laplace_problem_2d.run ();
}
2. Separate the run() and make_grid() calls.
{
Step4<2> laplace_problem_2d;
laplace_problem_2d.make_grid ();
bvalue = 1;
laplace_problem_2d.run ();//Remove make_grid() from run()
bvalue = 2;
laplace_problem_2d.run ();
}
You could of change your boundary value in other way, such as in a for loop
or using a MultipleParameterLoop
<https://www.dealii.org/8.4.1/doxygen/deal.II/classMultipleParameterLoop.html>
.
I hope this helps you.
Regards,
Jean-Paul
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