understanding the output from -info

Ben Tay zonexo at gmail.com
Sat Feb 10 23:41:31 CST 2007


I am simulating unsteady flow past a moving airfoil at Re~10^4. I'm using
fractional step FVM, which means that I need to solve a momentum and poisson

To reach a periodic state takes quite a few hours and so I'm trying to find
ways to speed up the process. I thought parallelizing the code would help
but it seems like it's not the case.

I'm now trying out different types of solver/preconditioner available on
PETSc to assess their performance. Is there other external solvers, which
PETSc interfaces, which are recommended? I'm thinking of using multigrid to
solve the poisson eqn... wonder if hypre/BoomerAMG etc would help...

On 2/11/07, Lisandro Dalcin <dalcinl at gmail.com> wrote:
> On 2/10/07, Ben Tay <zonexo at gmail.com> wrote:
> > In other words, for my CFD code, it is not possible to parallelize it
> > effectively because the problem is too small?
> >
> > Is these true for all parallel solver, or just PETSc? I was hoping to
> reduce
> > the runtime since mine is an unsteady problem which requires many steps
> to
> > reach a periodic state and it takes many hours to reach it.
> Can you describe your specific application and how are you solving it?
> As Barry said, your need-for-speed is not likely to be solved by
> running in parallel.
> --
> Lisandro Dalcín
> ---------------
> Centro Internacional de Métodos Computacionales en Ingeniería (CIMEC)
> Instituto de Desarrollo Tecnológico para la Industria Química (INTEC)
> Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)
> PTLC - Güemes 3450, (3000) Santa Fe, Argentina
> Tel/Fax: +54-(0)342-451.1594
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20070211/2cb2a768/attachment.htm>

More information about the petsc-users mailing list