For the record, the lines of code in my last post were wrong. It should be 
for the boundary worker :

    // new cell iterator for other dof_handler 
    typename DoFHandler<dim>::active_cell_iterator cell_2 (&cell->
get_triangulation(), cell->level(), cell->index(), &dof_handler_HE);

    // Initialise FEValues with FACE quadrature formula and reinitialise 
with current cell 
    FEFaceValues<dim> fe_values_HE_bound(mappingQ, fe_HE, 
quadrature_face_formula, update_values);
    fe_values_HE_bound.reinit(cell_2, face_no);
    
    std::vector<double> T_old_data_bound(q_points.size());
    fe_values_HE_bound.get_function_values(old_T,T_old_data_bound);

Best,

Sylvain M.

El viernes, 8 de octubre de 2021 a la(s) 14:30:54 UTC+2, Wolfgang Bangerth 
escribió:

> On 10/8/21 5:13 AM, Sylvain Mathonnière wrote:
> > How can one suspect there is such problem with the code in those cases ? 
> Just 
> > with experience I guess and doing multiple simulations ?
>
> Making every mistake myself at least once in the last 20 years has 
> certainly 
> helped me have an eye for things :-)
>
> Best
> W.
>
> -- 
> ------------------------------------------------------------------------
> Wolfgang Bangerth email: [email protected]
> www: http://www.math.colostate.edu/~bangerth/
>
>

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