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step-32: move initial guess assignment #16462

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Jan 12, 2024
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step-32: move initial guess assignment #16462

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11 changes: 6 additions & 5 deletions examples/step-32/step-32.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -2872,9 +2872,11 @@ namespace Step32
// approach towards time stepping. If you're curious about this, you may
// want to read the time stepping section in @cite HDGB17 .)
//
// After temperature right hand side assembly, we solve the linear system
// for temperature (with fully distributed vectors without any ghosts),
// apply constraints and copy the vector back to one with ghosts.
// After temperature right hand side assembly, we solve the linear
// system for temperature (with fully distributed vectors without
// ghost elements and using the solution from the last timestep as
// our initial guess for the iterative solver), apply constraints,
// and copy the vector back to one with ghosts.
//
// In the end, we extract the temperature range similarly to step-31 to
// produce some output (for example in order to help us choose the
Expand All @@ -2898,7 +2900,6 @@ namespace Step32
<< "Time step: " << time_step / EquationData::year_in_seconds
<< " years" << std::endl;

temperature_solution = old_temperature_solution;
assemble_temperature_system(maximal_velocity);
}

Expand All @@ -2912,7 +2913,7 @@ namespace Step32

TrilinosWrappers::MPI::Vector distributed_temperature_solution(
temperature_rhs);
distributed_temperature_solution = temperature_solution;
distributed_temperature_solution = old_temperature_solution;

cg.solve(temperature_matrix,
distributed_temperature_solution,
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