Judy:
(1) Is there an internal command/function that outputs
higher-order-elemental (Q2, Q3 elements) nodal physical coordinate?
Just like, "cell->vertex" outputs grid points that works for Q1 element.
If I want to count in a linear function f(x) = x on Laplace's
right-hand-side, should I just manually make an expression, to
interpolate mid-nodes, as well as other fractional-nodes @ 1/3 and 2/3
of each cell "he", to construct “x”?
You can query the location of all degrees of freedom via the
DoFTools::map_dofs_to_support_points() function. But I don't understand
the connection to your right hand side: you generally only ever need to
evaluate the right hand side function at *quadrature points*, not at
*node points*. You get the physical locations of quadrature points via
fe_values.quadrature_point(q_point)
as shown in several of the tutorial programs.
(2) In the nonlinear problem, are nodal physical coordinates updated
thru finite element program, like, including "phi_i * x_i" or
“grad_phi_i * x_i” for any i of each cell?
The library doesn't do anything unless you instruct it to, because it
has no idea what kind of equation you are solving. So, unless you
explicitly say "update the node location with this kind of information",
nothing will happen.
Best
W.
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Wolfgang Bangerth email: bange...@colostate.edu
www: http://www.math.colostate.edu/~bangerth/
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