Dear Professor,
My name is Hu Zhang, I’m an undergraduate student who is trying to
solve Poisson Equations by using deallii. Recently when I was using the
step-28 of the tutorial of the deal.ii library, I found that there is a
little problem in the assemble_cross_group_rhs function. When I output the
system_rhs vector and visualize it, the values in better refined cells are
much smaller than around cells, just like following pictures (see
attachments, the first is the values distribution before the adaptive
refine; the second is the distribution after it; the last is the
distribution after it and with grid on).
From figure b, we can see the values on the refined grid are very
lower than that before refine. I am thinking, the distribution on refined
grid should look same as before, whatever the grid is refined or not. I was
confused that the distribution after the refine (figure b) is quite
different with that before (figure a). In addition, when I assembled the
source term from local cell to global vector, the globe vector of r.h.s has
some problem. It looks like the values on some nodes are accounted more
than one time.
I’m a green hand in programming, and I really need your help, I
would quite appreciate if you can answer me quickly.
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