Hello Prof. Bangerth,
Yes I think I am setting them in a way that is exactly same throughout all
processes.
Since I can check the n_active_cells() before the refinement, and also the
refine_flags and coarsen_flags for each process. They are the same for each
process. But after the refinement, the number of active_cells suddenly
becomes different.
I attached the refine_mesh() code.
Best,
Yiyang
Vector<float> estimated_error_per_cell(this->tria.n_active_cells());
KellyErrorEstimator<dim>::estimate(this->dof_handler,
QGauss<dim - 1>(Q_POINTS),
typename FunctionMap<dim>::type(),
locally_relevant_sln,
estimated_error_per_cell,
ComponentMask(),
0,
MultithreadInfo::n_threads(),
Utilities::MPI::this_mpi_process(this->mpi_communicator));
IndexSet local_active_cells(this->tria.n_active_cells());
local_active_cells.clear();
for(auto cell = this->tria.begin_active(); cell != this->tria.end();
++cell){
if(cell->is_locally_owned()){
local_active_cells.add_index(cell->active_cell_index());
}
}
TrilinosWrappers::MPI::Vector
distributed_error_per_cell(local_active_cells, this->mpi_communicator);
for(auto cell = this->tria.begin_active(); cell != this->tria.end();
++cell){
if(cell->is_locally_owned()){
distributed_error_per_cell(cell->active_cell_index()) =
estimated_error_per_cell(cell->active_cell_index());
}
}
distributed_error_per_cell.compress(VectorOperation::insert);
estimated_error_per_cell = distributed_error_per_cell;
GridRefinement::refine_and_coarsen_fixed_number(this->tria,
estimated_error_per_cell,
param[0],
param[1],
max_cells);
//restrict grid levels if these two parameters are given.
if(max_grid_level > 0){
if (this->tria.n_levels() > max_grid_level) {
for (typename Triangulation<dim>::active_cell_iterator
cell = this->tria.begin_active(max_grid_level);
cell != this->tria.end(max_grid_level); ++cell) {
cell->clear_refine_flag();
}
}
}
if(min_grid_level > 0){
for (typename Triangulation<dim>::active_cell_iterator
cell = this->tria.begin_active(min_grid_level);
cell != this->tria.end_active(min_grid_level); ++cell) {
cell->clear_coarsen_flag();
}
}
int refine_count = 0;
int coarsen_count = 0;
for(auto cell = this->tria.begin_active(); cell != this->tria.end();
++cell){
if(cell->refine_flag_set()) refine_count++;
if(cell->coarsen_flag_set()) coarsen_count++;
}
std::cout<<"Process No.
"<<Utilities::MPI::this_mpi_process(this->mpi_communicator) <<". Refine
Count = "<<refine_count<<std::endl;
std::cout<<"Process No.
"<<Utilities::MPI::this_mpi_process(this->mpi_communicator) <<". Coarsen
Count = "<<coarsen_count<<std::endl;
SolutionTransfer<dim> sol_trans(this->dof_handler);
this->tria.prepare_coarsening_and_refinement();
sol_trans.prepare_for_coarsening_and_refinement(locally_relevant_sln);
std::cout<<"Process No.
"<<Utilities::MPI::this_mpi_process(this->mpi_communicator) <<".
Pre_refine, n_active_cells = "<<this->tria.n_active_cells()<<std::endl;
this->run_mesh_refinement();
std::cout<<"Process No.
"<<Utilities::MPI::this_mpi_process(this->mpi_communicator) <<".
Post_refine, n_active_cells = "<<this->tria.n_active_cells()<<std::endl;
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