Dear DuMuX experts,
i have adapted the simulation from the test folder
„dumux/test/porousmediumflow/mpnc/implicit/thermalnonequilibrium" .
I used the YASPGrid for 1D with grading:
struct Grid<TypeTag, TTag::CombustionOneComponent> { using type =
Dune::YaspGrid<1, Dune::TensorProductCoordinates<double,1> >; };
With 800 Elements (400 in the porous domain and 400 in the outflow)
and with 1600 Elements it works fin, but with more than 2000 Elements
I get the following error message:
Solve: M deltax^k = rNewton: Caught exception: "FMatrixError
[luDecomposition:/.../dumux/dune-common/dune/common/densematrix.hh:909]:
matrix is singular"
If I try it with grading I receive the following error message:
Solve: M deltax^k = rNewton: Caught exception: "NumericalProblem
[solveLinearSystem:/.../dumux/nonlinear/newtonsolver.hh:354]: Linear
solver did not converge"
Could you please help me to solve this problem? I tried it myself
several times but was not successful until now.
I suspect that an even finer grid is needed, since only in the last
element of the porous area does the temperature of the vapor increase
dramatically. Or does this behavior have a different reason? When the
heat flow is doubled, however, superheated steam is still calculated
only in the last element.
Thank you in advance and best regards,
Max
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