Jane,
I get that the stress boundary can be put into the weak form, but only
really when you have Neumann conditions.
Correct, but prescribing the stress in an elasticity problem is exactly
a Neumann boundary condition.
And why would I have to use a
compute_nonzero_normal_flux for a zero one?
I thought you had a nonzero displacement/velocity on parts of the
boundary? If it is zero, then of course you would want to use a
different function.
I believe it my have been my fault not being clearer.
On the 'side' boundaries, I have no normal flux.
On the other boundaries, I have a prescribed nonzero inhomogeneous
normal component of the normal stress (so this is only one of the
components).
On all boundaries, I have zero tangential stresses (which sorts out the
other 2 components in 2D in additions to the normal component conditions
from the above).
Can you just put that into formulas, to make things really clear? State
the equations you want to solve and for each type of boundary what
conditions hold there.
Maybe that would make it easier for everyone to understand what the
other side is saying :-)
Pardon my potential ignorance, but I'm unsure how I can put these in the
weak form when i have component-wise conditions (partial conditions).
I had thought to use compute_no_normal_flux_constraints for the side
boundaries and compute_nonzero_normal_flux_constraints for the other two
as constraints, but this doesn't seem to work.
Be specific here as well: what doesn't work? Do you get an assertion, or
a wrong solution, or a compiler error, ...?
Best
W.
--
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Wolfgang Bangerth email: bange...@colostate.edu
www: http://www.math.colostate.edu/~bangerth/
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