I'm sorry, I should have include "part for boundary of pressure"

What I mean by "part for boundary pressure in assemble_system" is (in 
step-20)

        for (unsigned int face_no=0;
             face_no<GeometryInfo<dim>::faces_per_cell;
             ++face_no)
          if (cell->at_boundary(face_no))
            {
              fe_face_values.reinit (cell, face_no);

              pressure_boundary_values
              .value_list (fe_face_values.get_quadrature_points(),
                           boundary_values);

              for (unsigned int q=0; q<n_face_q_points; ++q)
                for (unsigned int i=0; i<dofs_per_cell; ++i)
                  local_rhs(i) += -(fe_face_values[velocities].value (i, q) 
*
                                    fe_face_values.normal_vector(q) *
                                    boundary_values[q] *
                                    fe_face_values.JxW(q));
            }

Thank you.

Kyusik.

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