I have a question about FEMSystem::init_context and inherited instances
like NavierSystem::init_context from example 18. Why is it necessary to
call get_JxW(), get_phi(), etc? In FEMSystem::assembly() this is only
called once before we have actually started looping over any elements.
Furthermore, all of the get_* functions are actually called again in the
appropriate *_time_derivative, and *_constraint functions. I believe
they are appropriate in this latter case because a specific element has
been specified at this point. I tried commenting out this block of code
in ex18, and it doesn't appear to break anything. Can anyone explain if
and what the purpose of this code is?
Thanks,
--
Truman Ellis
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