[petsc-users] Regarding ksp ex42 - Citations

[domenico lahaye]

Thanks for all the pointers. 
I am happy to switch to ksp/examples/tutorials/ex25.c in a first instance as you suggest.
    I am still stuck with the same issue as before though. I am trying to extract the hierarchy     of coarser grid matrices and the intergrid transfer operators from the DMDA data structure. I would     like to modify these operators and define a multigrid cycle with the modified operators. 
    Given A^h (Helmholtz) and M^h (shifted Laplace), I would like to define a multigrid cycle involving     both A^H and M^H. Can I rely on the multilevel DMDA structure to construct A^H and M^H for me     in a set-up phase, plug them into a user-defined context, and plug them back out in a solve phase? 
Thanks, Domenico. 

      From: Matthew Knepley <knepley at gmail.com>
 To: Barry Smith <bsmith at mcs.anl.gov> 
Cc: domenico lahaye <domenico_lahaye at yahoo.com>; "petsc-users at mcs.anl.gov" <petsc-users at mcs.anl.gov>
 Sent: Sunday, July 17, 2016 2:29 PM
 Subject: Re: [petsc-users] Regarding ksp ex42 - Citations
  
On Sat, Jul 16, 2016 at 10:11 PM, Barry Smith <bsmith at mcs.anl.gov> wrote:


> On Jul 14, 2016, at 12:21 PM, domenico lahaye <domenico_lahaye at yahoo.com> wrote:
>
> Dear PETSc team,
>
> 1) I am looking into ks/examples/tutorials/ex42.c I am still new to the DMDA structure
>     and likely not giving it as much time as it deserves. However, I do not see immediately
>     what function is responsible for calling PCMGSetSmoother and PCMGSetResidual.
>
>      I tried to call PCMGGetCoarseSolve(pc, &kcpc) and subsequently
>      KSPGetOperators (kspc, ... ) to check how the coarse grid operator is defined
>      after calling DMCoarsenHierarchy, but that failed.
>
>      I am solving Helmholtz with shifted Laplace, and managed to exploit DMDA to perform
>      a multigrid solve on the preconditioner. In a next stage I want to implement the deflation
>      using DMDA as well.
>
> 2) On http://www.mcs.anl.gov/petsc/documentation/referencing.html I see
>
> @Misc{petsc-web-page,
>             author = {Satish Balay and Shrirang Abhyankar and Mark~F. Adams and Jed Brown and Peter Brune
>                       and Kris Buschelman and Lisandro Dalcin and Victor Eijkhout and William~D. Gropp
>                       and Dinesh Kaushik and Matthew~G. Knepley
>                       and Lois Curfman McInnes and Karl Rupp and Barry~F. Smith
>                       and Stefano Zampini and Hong Zhang and Hong Zhang},
>             title =  {{PETS}c {W}eb page},
>             url =    {http://www.mcs.anl.gov/petsc},
>             howpublished = {\url{http://www.mcs.anl.gov/petsc}},
>             year = {2016}
>           }
>
>
>
> Is the last author mentioned twice intentionally?
>
> 3) On http://www.mcs.anl.gov/petsc/publications/petscapps-bib.html#OpenFOAM%202.2.1 I see
>
> @misc{OpenFOAM
> ,
>
>
> title =       "OpenFOAM",
>
> howpublished  =       "\url{http://www.openfoam.com}",
>
> url   =       {http://www.openfoam.com},
>
> note  =       "OpenFOAM is a free, open source CFD software package. It allows PETSc linear algebra and solvers to be used underneath.",
>
> key   =       "OpenFOAM 2.2.1"
>
> }
>
>
> Do you have more information on the use of PETSc within OpenFoam?

  Very good question. It seems that this citation is wrong or no longer valid; I have removed it from the PETSc repository. I could find no mention of PETSc usage in the OpenFoam and its third party packages. I think we should not have been listing this citation.

This suggests that people are using it with OpenFOAM: http://powerlab.fsb.hr/ped/kturbo/OpenFOAM/slides/PatersonNuTTS2009.pdf
In fact, they use PETSc in the dynamic overset grid implementation for OpenFOAM, which I think is an approved extension:
  http://web.student.chalmers.se/groups/ofw5/Abstracts/DavidBogerAbstractOFW5.pdf
     Matt 

   Barry

>
> 4) @matt in response to a question he raised in Vienna
>
> MIPSE is a BEM solver. Details are on:
> http://www.g2elab.grenoble-inp.fr/plateforms/mipse-modeling-of-interconnected-power-systems-632862.kjsp?RH=G2ELAB_R-MAGE
>
> Cheers, Domenico Lahaye.
>





-- 
What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.
-- Norbert Wiener

  
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