Well, as I said deal.II is integrated into another software (DAE Tools,
mostly chemical engineering applications i.e. the fluid flow coupled
with several scalar transport equations). Now, it works well. Basically,
the system assembly is done only once (no adaptive meshes used). The
system matrices/load vector are used to generate a set of diff.
equations + additional equations for surface integrals. That way, the
surface integrals are evaluated and available at every time step. All
these equations are a part of the larger DAE system solved using
Sundials IDA. The boundary conditions and generation terms (typically
very non-linear) can be set using the variables from the "outer"
software and the surface integrals are stored in the variables from the
outer software. This typically produces a coupled system with a
non-linear FE problem in it. The Newton type non-linear solver in IDA is
used to solve the system (during the time step taken by the DAE solver;
the analytical Jacobian is available).
Typical results from a FE system are quantities that flow in/out of the
system (thus the need for surface integrals). I have a couple of working
examples at the moment:
a) Heat transfer (surface integrals are the total heat transferred)
b) Cahn-Hilliard equation (i.e. used in electrochemistry - modelling of
phase separation). This is particularly interesting since it produces
excellent animations. Something like this on Wikipedia:
https://en.wikipedia.org/wiki/Cahn%E2%80%93Hilliard_equation. Many FE/FV
software has this as an example (i.e. FiPy, libMesh also somewhere). I
can generate some very cool videos for the gallery.
It needs a more detailed explanation, but this is the basically it. I am
planning to write some longer description soon
Dragan
On 23/09/16 22:13, Wolfgang Bangerth wrote:
On 09/23/2016 11:30 AM, dragniko...@gmail.com wrote:
Oh yes, that' exactly what I wanted (in the post-processing case).
Thanks.
And if I want to do it during integration?
What do you mean by "during integration"? What are you integrating at
that time?
Best
W.
--
The deal.II project is located at http://www.dealii.org/
For mailing list/forum options, see
https://groups.google.com/d/forum/dealii?hl=en
---
You received this message because you are subscribed to the Google Groups "deal.II User Group" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to dealii+unsubscr...@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.
