KyusikMaterial ids are only stored as unsigned char objects, which can only
represent values up to 255. You may want to use the user_index instead.
BestWolfgang
Sent from Samsung tablet.
-------- Original message --------
From: [email protected]
Date: 12/13/2016 05:20 (GMT-07:00)
To: "deal.II User Group" <[email protected]>
Subject: [deal.II] Duplication access to the cell?
Dear All,
I'm trying to calculate something differently depending on material id.
So, I have to set material id before next iteration.(I'm going to use picard
iteration)
The way I have done is
1.the middle point of mesh would be selected. (it is indicated as max_cell in
my code)2.the neighbor cells of max_cell are accessed and the neighbor cells of
those neighbor cells would be also accessed later.3.If neighbor cell satisfy
the certain condition and have never been accessed before I will set the new
material id on these cells. (The condition is "fabs(solution)>=fabs(psi_b) "
and the new material id would be same as iteration number to check whether it
has been accessed before) 4.those cells that satisfy the condition, would also
have access to the neighbor cells.(those neighbor cells are indicated as
next_cell in my code)5.the process would continue until there is no neighbor
cells anymore that satisfy fabs(solution)>=fabs(psi_b)
i.e. What I'm going to do is to set the new material id in the inside of
contour of psi_b.
So, my code is as follows.
template <int dim>void Step6<dim>::set_id (){ const QGauss<dim>
quadrature_formula(2); FEValues<dim> fe_values (fe, quadrature_formula,
update_values | update_quadrature_points);
const unsigned int n_q_points = quadrature_formula.size();
std::vector<typename DoFHandler<dim>::cell_iterator> next_cell;
std::vector<typename DoFHandler<dim>::cell_iterator> neigh_cell; typename
DoFHandler<dim>::cell_iterator neigh_cell_tmp; std::vector<double>
sol_tmp(n_q_points);
std::cout<<"to check out the position of max cell"<<std::endl;
fe_values.reinit(max_cell); const Point<dim> &p=fe_values.quadrature_point(0);
std::cout<<"R_max="<<p(0)<<"Z_max="<<p(1)<<std::endl;
std::cout<<"mat_id="<<int(max_cell->material_id())<<std::endl;
max_cell->set_material_id(iter); //set new material
id as iteration number for(unsigned int face_no=0;face_no<
GeometryInfo<dim>::faces_per_cell;++face_no) //starting from the neighbor cells
of max_cell next_cell.push_back(max_cell->neighbor(face_no));
while(next_cell.size()!=0) //until there is no neighbor cells that satisfy
the condition anymore. { neigh_cell.clear();
neigh_cell.resize(next_cell.size()); std::copy(next_cell.begin(),
next_cell.end(),neigh_cell.begin()); next_cell.clear(); for(unsigned
int i=0; i<neigh_cell.size(); ++i) {
fe_values.reinit(neigh_cell[i]);
fe_values.get_function_values(solution,sol_tmp); unsigned int
determine=0; //to determine that whether all quad points
are not satisfied with the condition. for(unsigned int q=0; q <
n_q_points; q++) { if(std::fabs(sol_tmp[q])>=std::fabs(psi_b))
{ neigh_cell[i]->set_material_id(iter);
for(unsigned int face_no=0;face_no<
GeometryInfo<dim>::faces_per_cell;++face_no) {
neigh_cell_tmp=(neigh_cell[i]->neighbor(face_no));
if(int(neigh_cell_tmp->material_id())!=iter) //To exclude the already checked
cell { next_cell.push_back(neigh_cell_tmp);
} } break; } determine++;
} if(determine==n_q_points) //if all points on the cell are not
satisfied with the condition, set material id as zero {
neigh_cell[i]->set_material_id(0); //vacuum } }
std::cout<<"#next_cell="<<next_cell.size()<<std::endl; }}
the above code works. However, the problem is when I check the number of
next_cell, it is much larger than the number of active cells.
The number of active cells is 9390 but the number of active cell is from 11 to
16359020 that is much larger than 9390.
I guess that "if(int(neigh_cell_tmp->material_id())!=iter) //To exclude the
already checked cell" this part in the above code is not working properly. So,
the duplication of access happens.
Could you let me know what the problem is in the above code...?
Thank you.
Kyusik.
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