[petsc-users] examples of DMPlex*FVM methods

[Ingo Gaertner]

Hi Jed,
thank you for your reply. Two followup questions below:

2017-04-04 22:18 GMT+02:00 Jed Brown <jed at jedbrown.org>:

> Ingo Gaertner <ingogaertner.tus at gmail.com> writes:
>
> > We have never talked about Riemann solvers in our CFD course, and I don't
> > understand what's going on in ex11.
> > However, if you could answer a few of my questions, you'll give me a good
> > start with PETSc. For the simple poisson problem that I am trying to
> > implement, I have to discretize div(k grad u) integrated over each FV
> cell,
> > where k is the known diffusivity, and u is the vector to solve for.
>
> Note that ex11 solves hyperbolic conservation laws, but you are solving
> an elliptic equation.
>

I begin to understand. Petscs FVM methods don't provide a FVM library that
can be used to implement the FV control volume approach (see Ferziger) for
general CFD problems? They are around just because they have been used to
tackle one or two specific problems, is this correct?
I thought they could be used similar to the OpenFvm or OpenFoam libraries
which seem to solve Poisson, Navier-Stokes, Euler and other problems. If
such methods have not been prepared for Petsc, I'll just follow Ferzigers
book and start my work on a lower level than I thought would be necessary.
More work, more fun :)

>
> > (My second question is more general about the PETSc installation. When I
> > configure PETSc with "--prefix=/somewhere --download-triangle
> > --download-parmetis" etc., these extra libraries are built correctly
> during
> > the make step, but they are not copied to /somewhere during the "make
> > install" step.
>
> Where are they put during configure?
>

My bad, Petsc installation works as expected. But the build system that I
am using is doing something weird. I'll have to find out, what's going
wrong there, but it is not related to Petsc.

Thank you!
Ingo


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