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Fix for https://github.com/dealii/dealii/issues/15882 #15912

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Aug 22, 2023
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Fix for https://github.com/dealii/dealii/issues/15882 #15912

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25 changes: 23 additions & 2 deletions include/deal.II/lac/petsc_ts.templates.h
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Original file line number Diff line number Diff line change
Expand Up @@ -1088,13 +1088,28 @@ namespace PETScWrappers
PetscReal atol, rtol;
AssertPETSc(TSGetTolerances(ts, &atol, nullptr, &rtol, nullptr));

// Fill up vectors with individual tolerances, using -1 for the
// algebraic variables.
// We need to input them with the same vector type of our solution
// but we are not sure that the user's VectorType supports operator[]
// We thus first create standard vectors that we know support the
// operator, and then copy the values into the user's type operator.
Vec av, rv;
Vec py = const_cast<VectorType &>(y).petsc_vector();
AssertPETSc(VecDuplicate(py, &av));
AssertPETSc(VecDuplicate(py, &rv));

VectorType avdealii(av);
VectorType rvdealii(rv);
// Standard vectors
Vec avT, rvT;
PetscInt n, N;
AssertPETSc(VecGetLocalSize(py, &n));
AssertPETSc(VecGetSize(py, &N));
AssertPETSc(VecCreateMPI(this->get_mpi_communicator(), n, N, &avT));
AssertPETSc(VecDuplicate(avT, &rvT));

// Fill-up the vectors
VectorBase avdealii(avT);
VectorBase rvdealii(rvT);
avdealii = atol;
rvdealii = rtol;
for (auto i : algebraic_components())
Expand All @@ -1104,9 +1119,15 @@ namespace PETScWrappers
}
avdealii.compress(VectorOperation::insert);
rvdealii.compress(VectorOperation::insert);

// Copy, set and destroy
AssertPETSc(VecCopy(avT, av));
AssertPETSc(VecCopy(rvT, rv));
AssertPETSc(TSSetTolerances(ts, atol, av, rtol, rv));
AssertPETSc(VecDestroy(&av));
AssertPETSc(VecDestroy(&rv));
AssertPETSc(VecDestroy(&avT));
AssertPETSc(VecDestroy(&rvT));
}
}

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