Hi Andrew Jack,
This is a reasonable start but, as the error messages state, you need to
implement some more features in your code for this to work. In particular,
step-26 has a separate function that reinitializes all of the DoFs, sparsity
patterns, and matrices called setup_system() - there is no equivalent ins
tep-35 because that program does not use time-dependent AMR. The same goes for
the solution transfer object - you will need to set up "before and after"
vectors if you want to use prolongatation and restriction to transfer the
solution across mesh refinements.
Best,
David Wells
________________________________
From: dealii@googlegroups.com <dealii@googlegroups.com> on behalf of andrew
jack urombo <juro...@hit.ac.zw>
Sent: Thursday, June 24, 2021 2:40 AM
To: dealii@googlegroups.com <dealii@googlegroups.com>
Subject: [deal.II] adaptive mesh refinement for Navier Stokes
I am working on a adaptive finite elements for flows. For starters I want to
base my simulation on Step 35 and introduce the refine_mesh( ) like in Step 26
to it:
See attached code snippet.
When I make I get the error message:
[ 50%] Building CXX object CMakeFiles/step-35a.dir/step-35a.cc.o
/home/dealii/examples/step-35a/step-35a.cc: In member function ‘void
Step35a::NavierStokesProjection<dim>::refine_mesh(unsigned int, unsigned int)’:
/home/dealii/examples/step-35a/step-35a.cc:1057:5: error: there are no
arguments to ‘setup_system’ that depend on a template parameter, so a
declaration of ‘setup_system’ must be available [-fpermissive]
1057 | setup_system();
| ^~~~~~~~~~~~
/home/dealii/examples/step-35a/step-35a.cc:1057:5: note: (if you use
‘-fpermissive’, G++ will accept your code, but allowing the use of an
undeclared name is deprecated)
/home/dealii/examples/step-35a/step-35a.cc:1059:32: error: ‘previous_solution’
was not declared in this scope
1059 | solution_trans.interpolate(previous_solution, output_results);
| ^~~~~~~~~~~~~~~~~
/home/dealii/examples/step-35a/step-35a.cc:1060:5: error: ‘constraints’ was not
declared in this scope
1060 | constraints.distribute(output_results);
| ^~~~~~~~~~~
make[2]: *** [CMakeFiles/step-35a.dir/build.make:63:
CMakeFiles/step-35a.dir/step-35a.cc.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:272: CMakeFiles/step-35a.dir/all] Error 2
make: *** [Makefile:84: all] Error 2
dealii@cd3db784d9d2:~/examples/step-35a$ ^C
Anyone with any idea how to fix this, or have implemented a similar problem in
dealii.
Thank you.
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