Dear developers/users,
I'm working on tutorial step 19, and I have some exact questions as well as
some related follow-up questions. I'll list them here, and I would
appreciate your help.
1.
On line 313, there is the line “fe.shape_value(i, reference_location)”.
The “reference_location” is defined from
“particle.get_reference_location()”. “particle” is an instance of the
“Particles::Particle” class, and the description of its
“get_reference_location()” function says: "Return the reference location of
this particle in its current cell.”
My question is whether the reference location of the particle in its
current cell refers to the real coordinates (x, y, z) or the reference
coordinates (\xi_1, \xi_2, \xi_3) within the cell.
2.
On line 509, 'cell->minimum_vertex_distance()', where 'cell' is defined
by 'const auto &cell : dof_handler.active_cell_iterators()'. According to
the documentation, 'cell' should be of type 'active_cell_iterator', because
of ‘IteratorRange< active_cell_iterator > active_cell_iterators () const’ .
However, I couldn't find 'minimum_vertex_distance()' as a method of
'active_cell_iterator' in the manual. What the exact type of 'cell' is and
how it's able to access 'minimum_vertex_distance()'?
3.
In the documentation, the FEValues class template
requires two template arguments, 'dim' and 'spacedim'. However, on lines
227 and 534, FEValues is instantiated with only one template argument,
FEValues. Similarly, for ‘std::vector>
field_gradients(vertex_quadrature.size())’ on line 536, the Tensor class is
used with two arguments. ‘fe_values.get_function_gradients(solution,
field_gradients)’ on line 546 uses field_gradients. but the
get_function_gradients in the documentaiton is ‘void FEValuesBase< dim,
spacedim >::get_function_gradients ( const ReadVector< Number > &
fe_function, std::vector< Tensor< 1, spacedim, Number > > & gradients )
const’ , the Tensor template appears to require three arguments.
Why there is a discrepancy in the number of template arguments used in
these instances?
4.
In the inheritance diagram, what does the dashed yellow line represent?
[image: Untitled.png]
5.
In the 'Result' section of tutorial step-19, there's a simulation video.
How can I create a similar animation, and what does the deep blue curve
line in it represent?
6.
In the ”make_grid()” function, four different boundary IDs are assigned
to the boundaries. Is there a way I can visualize these boundaries in
ParaView or VisIt, so that I can verify if the boundaries are set correctly?
7.
When running code in deal.II, is there a way to enable a debug mode
similar to MATLAB or other IDEs? I'd like to execute the code line by line
starting from the main function, understand the program's logic, and check
the values of parameters (e.g., vertex_quadrature.size()). This would help
me gain a deeper understanding of what the program does.
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