[ErikNij]

Hi all,



I am struggling with adding a custom decomp method to OpenFOAM. This library successfully complies to a .o object, and further to a .so object. However, it does not show up as an option when using DecomposePar. Perhaps its relevant that I am using foam-extend4.1.


For simplicity, I was just trying to get a new decomp method called metisDecomp2, which is just the same as metisDecomp, but I just want to show that something new can be added. So I copied the metisDecomp/ folder, renamed it to metisDecomp2/, and renamed all the files, and moved it to the $FOAM_USER_LIBBIN


I crtl+F metisDecomp and replaced it with metisDecomp2 in the C and H file, to make the new class. I updated the Make/files, Make/options, and CMakeLists.txt as shown below.




Make/files:

metisDecomp2.C

LIB = $(FOAM_USER_LIBBIN)/libmetisDecomp2

Make/options:

EXE_INC = \
    -I$(METIS_INCLUDE_DIR) \
    -I$(FOAM_SRC)/decompositionMethods/lnInclude \
    -I$(FOAM_SRC)/scotchDecomp/lnInclude

LIB_LIBS = \
    -ldecompositionMethods \
    -L$(FOAM_LIBBIN)/dummy \
    -L$(METIS_LIB_DIR) -lmetis

and the CMakeLists.txt

list(APPEND SOURCES
  metisDecomp2.C
)

add_foam_library(metisDecomp2 SHARED ${SOURCES})

target_link_libraries(metisDecomp2 PUBLIC decompositionMethods metis2)

After I do all this, and put the option metis2, it says:

Unknown decompositionMethod metis2

Valid decompositionMethods are : 

8
(
engineScotch
hierarchical
manual
metis
parMetis
patchConstrained
scotch
simple
)

I assume that I am missing something small and simple. I have never added my own custom lib. Thanks for your time looking over my question. If you need any more clarification, please let me know.



Best,
Erik

[klausb]

I had a look at the decomposePar.C... sources and Make files, according to that "EXE = $(FOAM_APPBIN)/decomposePar" it's meant to be an application, not a library.


The best way to start developing new things in OpenFOAM is to copy the most similar application or library, change the name compile and run it under the new name, if that works, make your changes and compile your new application or library. For applications use wmake and wclean, for libraries use wmake libso and wclean libso. Custom libraries need to be added to the control dictionary as follows:

/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  v2312                                 |
|   \\  /    A nd           | Website:  www.openfoam.com                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       dictionary;
    object      controlDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

libs ("libMyLibraryName.so");

...