Thanks a lot that helped, I applied symmetric<2,dim> tensor because it is a
heat problem. I also implemented the convection boundary condition. I have
a problem in the results, it seems the contact between surfaces is not
detected automatically, I want to model such contact.Please I will be
grateful for your guidance.[image: contact problem.png]
On Monday, August 16, 2021 at 9:43:25 PM UTC+2 Wolfgang Bangerth wrote:
> On 8/16/21 10:37 AM, ibrahim zawra wrote:
> >
> > real problem for graphical board . I used GMSH and identified different
> > material_ids on different parts and made sure it is correct using the
> function
> > print mesh info.
> > I wrote the class Material data to substitute the coefficient function.
> but I
> > tried several things but it didn't work.
>
> You don't say what specifically you have tried and how or why it didn't
> work.
> But the usual way to do this would be in the assemble_system() function,
> where
> you would do
>
> for (auto &cell : dof_handler.active_cell_iterators())
> {
> fe_values.reinit (cell);
>
> SymmetricTensor<4,dim> strain_stress_tensor;
> if (cell->material_id() == ...)
> strain_stress_tensor = ...whatever is appropriate for this material...;
> else
> strain_stress_tensor = ...whatever is appropriate for other materials..;
>
> for (unsigned int q=...)
> for (unsigned int i=...)
> for (unsigned int j=...)
> cell_matrix(i,j) += ...something that uses the strain stress tensor;
>
> ...
> }
>
> Best
> W.
>
> --
> ------------------------------------------------------------------------
> Wolfgang Bangerth email: bang...@colostate.edu
> www: http://www.math.colostate.edu/~bangerth/
>
>
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