[petsc-users] calculating eigenvalues for the Stokes equations in 3D

[Dave May]

On Tue, 29 Oct 2019 at 08:59, <av-baron at yandex.ru> wrote:

> Hi, Dave! Thank you for your assistance. The problem is that I don't have
> the matrix representation for my problem.
>

You will have to explain in more detail if you want further help.
Explain what "I don't have the matrix representation for my problem" means.
If you don't have a matrix representation, how do you solve the forward
problem??

Maybe you mean you use a matrix-free (MF) method. That is still a matrix
representation of your problem, however the MF representation does not
explicitly store the matrix a_{ij} entries in a CSR (or other) format.


>  I've searched on the internet for a solution, but found only some
> examples of solving 2D eigenvalue problems for the Stokes equations. Maybe
> you could help me with the matrix representation for the 3D Stokes
> eigenvalue problem?
> Thank you in advance,
> Alex
>
> 29.10.2019, 11:16, "Dave May" <dave.mayhem23 at gmail.com>:
>
>
>
> On Tue 29. Oct 2019 at 08:13, alex via petsc-users <
> petsc-users at mcs.anl.gov> wrote:
>
> Hello!
> In my project I have to calculate eigenvalues for the three dimensional
> Stokes equations with Dirichlet boundary conditions. I would like to use
> SLEPc iterative solver for this purpose, but I'm not quite sure how I
> should set up the matrices for the solver. I would be grateful if anyone
> could share a source code for solving this eigenvalue problem.
>
>
> I presume your forward model uses petsc. What matrix representation do you
> use in that code? Why cannot they be used directly with slepc?
>
> Thanks
> Dave
>
>
>
>
> Thank you very much!
> Alex
>
>
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