Hi
I am getting trouble here again ... really need some help.
I have part of the domain without flow (and thus without the pressure
variable defined).
As I could not export that (could not get write_discontinuous_exodusII to
work) I just left the matrix empty, without major impact so far.
However, now I am using LU preconditioning, which does not accept empty
entries in the diagonal.
How can I get through?
Any suggestion?
Thanks upfront.
Renato
On Thu, Aug 16, 2018 at 6:47 PM Renato Poli <rebp...@gmail.com> wrote:
> Hi
>
> I see the stack trace below when writing a discontinuous timestep
> (exo.write_discontinuous_timestep).
> It happens when my variable is set only in part of the domain.
> No problem arises if I use, instead: exo.write_equation_systems(fname, es)
>
> Any hint/workaround/idea?
>
> Thanks,
> Renato
>
> This is how the variable is set.
> | std::set<subdomain_id_type> active_subdomains;
> | active_subdomains.clear();
> | active_subdomains.insert(SUBDOMAIN_A);
> | press_sys.add_variable ("p", SECOND, LAGRANGE, & active_subdomains);
>
> 0: libMesh::print_trace(std::ostream&)
> 1: libMesh::MacroFunctions::report_error(char const*, int, char const*,
> char const*)
> 2:
> libMesh::EquationSystems::build_discontinuous_solution_vector(std::__debug::vector<double,
> std::allocator<double> >&,
> std::__debug::set<std::__cxx11::basic_string<char, std::char_traits<char>,
> std::allocator<char> >, std::less<std::__cxx11::basic_string<char,
> std::char_traits<char>, std::allocator<char> > >,
> std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>,
> std::allocator<char> > > > const*) const
> 3:
> libMesh::ExodusII_IO::write_discontinuous_exodusII(std::__cxx11::basic_string<char,
> std::char_traits<char>, std::allocator<char> > const&,
> libMesh::EquationSystems const&,
> std::__debug::set<std::__cxx11::basic_string<char, std::char_traits<char>,
> std::allocator<char> >, std::less<std::__cxx11::basic_string<char,
> std::char_traits<char>, std::allocator<char> > >,
> std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>,
> std::allocator<char> > > > const*)
> 4:
> libMesh::ExodusII_IO::write_timestep_discontinuous(std::__cxx11::basic_string<char,
> std::char_traits<char>, std::allocator<char> > const&,
> libMesh::EquationSystems const&, int, double,
> std::__debug::set<std::__cxx11::basic_string<char, std::char_traits<char>,
> std::allocator<char> >, std::less<std::__cxx11::basic_string<char,
> std::char_traits<char>, std::allocator<char> > >,
> std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>,
> std::allocator<char> > > > const*)
>
>
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