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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