[petsc-users] Problem coupling Petsc into OpenFOAM

[Vu Do Quoc]

Dear All,

Thanks so much for all of your prompt responses!

By defining the LD_LIBRARY_PATH env variable in .bashrc, I have been able
to call the solver.
However, as Berry mentioned, I cannot directly call for Petsc solver at the
moment. So I guess I would need to create an interface for Petsc and
OpenFOAM.
I have taken a look at rheoTool and it seems like the latest version
provides some really nice reference.

Thanks again for your help.

Best regards,

Vu

On Thu, Apr 11, 2019 at 4:55 AM Mark Olesen <Mark.Olesen at esi-group.com>
wrote:

> The paper that Barry mentioned gives some generalities, but probably
> won't help much. There are some PETSc/OpenFOAM interfaces in rheoTool
> that are probably much more helpful.
>
> As Barry also rightly noted, there are some config files in the OpenFOAM
> tree that were put in some time ago for helping with setting up PETSc
> and OpenFOAM. Assuming that you have set the appropriate values in the
> etc/config.sh/petsc file you will be able to use those when using wmake.
> For running you will still need to ensure that the LD_LIBARY_PATH is set
> correctly. For example, what some build scripts exhibit:
>
> wmake(petsc)  :
> ==> Before running, verify that PETSc libraries can be found
>
> Enable in the OpenFOAM etc/bashrc, define manually or try with the
> following (POSIX shell):
>
>      eval $(foamEtcFile -sh -config petsc -- -force)
>
> ==
>
>
> There is currently a PRACE project running via CINECA (Bologna) with
> binding in PETSc as a runtime selectable linear solver in OpenFOAM. This
> is still at the stage of early testing and performance benchmarking.
>
> Cheers,
> /mark
>
> On 4/10/19 6:37 PM, Smith, Barry F. via petsc-users wrote:
> >
> >    We don't know much about OpenFoam but
> >
> > 1)  if I do a
> >
> >    git grep -i petsc
> >
> >      in the https://develop.openfoam.com/Development/OpenFOAM-plus.git
> repository I see various configuration files specifically for PETSc.
> >
> > etc/config.csh/petsc  etc/config.sh/petsc wmake/scripts/have_petsc
> >
> >      so it appears that OpenFOAM has the tools to be linked against
> PETSc (to me the documentation on how to use them is rather terse). Are
> >      you using these?  If you have trouble with them perhaps you can ask
> the OpenFOAM user community how to use them.
> >
> >
> >    2)  if you are editing the Make/options file directly you can try
> changing
> >
> >       -L$(PETSC_DIR)/$(PETSC_ARCH)/lib -lpetsc
> >
> >       to
> >
> >       -Wl,-rpath,$(PETSC_DIR)/$(PETSC_ARCH)/lib
>  -L$(PETSC_DIR)/$(PETSC_ARCH)/lib -lpetsc
> >
> >
> >
> >     Note also that simply including petsc.h into the OpenFoam source
> code and linking against -lpetsc will not immediately allow calling the
> PETSc solvers from OpenFOAM. One needs to write all the interface code that
> sets up and calls the PETSc solvers from OpenFOAM. There is a paper
> https://www.researchgate.net/publication/319045499_Insertion_of_PETSc_in_the_OpenFOAM_Framework
> that describes at an abstract level how they wrote code that calls the
> PETSc solvers from OpenFOAM but the source code that actually does the work
> does not appear to be available.
> >
> >     Note that PETSc is now at version 3.11 we recommend working with
> that version (unless you already have a lot of code that calls PETSc
> written with a previous version of PETSc, for that we recommend first
> upgrading to petsc 3.11 and then continuing to add code).
> >
> >     Barry
> >
> >
> >
> >
> >
> >> On Apr 10, 2019, at 8:23 AM, Balay, Satish via petsc-users <
> petsc-users at mcs.anl.gov> wrote:
> >>
> >> Runtime error? You might have to add the path to $PETSC_ARCH/lib in
> LD_LIBRARY_PATH env variable
> >> or - to your link command. If linux/gcc - the linker option is
> -Wl,-rpath,$PETSC_ARCH/lib
> >>
> >> If not - send detail logs.
> >>
> >> Satish
> >>
> >> On Wed, 10 Apr 2019, Vu Do Quoc via petsc-users wrote:
> >>
> >>> Hi all,
> >>>
> >>> I am trying to insert Petsc to OpenFOAM opensource software.
> >>> I have been successfully compiling Petsc with an available solver in
> >>> OpenFOAM by linking it with the shared library libpetsc.so. However,
> when I
> >>> call the solver to run a test case, I got an error saying that:
> >>> "libpetsc.so cannot be found", even though the library still exists in
> the
> >>> $PETSC_ARCH/lib folder.
> >>>
> >>> I have been struggling for weeks but still, have not been able to
> figure it
> >>> out. Therefore I would be very grateful for any suggestion to solve
> this
> >>> problem.
> >>>
> >>> Thanks in advance for your time,
> >>>
> >>> Best regards,
> >>>
> >>> Vu Do
> >>>
>


-- 

*Vu Q. Do*------------------------------------------------
*Student of Aeronautical Engineering*
Programme de Formation d'Ingénieurs d'Excellence au Vietnam *- PFIEV*
School of Transportation Engineering
Hanoi University of Science and Technology
01 Dai Co Viet Avenue, Hanoi, Vietnam
E-mail: vu.doquochust at gmail.com
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