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Difference between OpenFOAM and FOAM extend

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Old   February 18, 2016, 21:22
Default Difference between OpenFOAM and FOAM extend
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Zhifang Hu
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Hi there

I have been using OpenFOAM 2.4.0 for a while, but recently a friend of mine recommending me using FOAM extend.

I did some rearch, but couldnt get what i want. Is there any documentation that showing the main difference between OpenFOAM and FOAM extend

Many thanks
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Old   February 19, 2016, 10:31
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I think there is no official document.

FOAMExtend offers more/other or well tested solvers. Especially if you look into solid mechanic solvers, foamExtend offers a lot of more solvers. Additionally, mathematic functions are implemented differently sometimes and so on and so on.

Keep in mind, everybody cooks with water. To implement an equation could be done in a lot of different ways. Also numerical stabilization terms etc. can be insert.
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Old   February 21, 2016, 05:39
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Francesco Manara
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Hi Zhifang,

you can have a look here:

https://sourceforge.net/p/openfoam-e...leaseNotes.txt
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Old   February 21, 2016, 15:58
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Quick answer: Adding to the answers above, all of foam-extend's release notes have links to from the top right of the main page at http://openfoamwiki.net

In addition, the release notes for 1.6-ext (the predecessor of foam-extend 3.0) also includes some important details: https://sourceforge.net/p/openfoam-e...eNotes-1.6-ext
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Old   May 9, 2016, 09:24
Smile How to set up a test case using any foam extend tutorial
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Sourabh Supanekar
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Hello all,

I have been looking to learn foam extend for a while now. I haven't found any guiding tutorials for running these foam extend tutorials. They are quite different than the ones I used before in OpenFOAM. Can anyone suggest about how to set up a test case in foam extend (preferably FSI)?

Any help would be appreciated.

Thanks in advance
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Old   May 9, 2016, 20:39
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Quote:
Originally Posted by Sourabhsup View Post
Hello all,

I have been looking to learn foam extend for a while now. I haven't found any guiding tutorials for running these foam extend tutorials. They are quite different than the ones I used before in OpenFOAM. Can anyone suggest about how to set up a test case in foam extend (preferably FSI)?

Any help would be appreciated.

Thanks in advance
Hi there,

I do believe that foam-extend shares the same techinc as openfoam, except few difference in the name at set-up. For example, alpha.water is call alpha1 in foam-extend. Only small thing changes.
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Old   October 17, 2019, 02:57
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Dear All,


In this regard I have a query, I already have OpenFoam 19.06, do I need to install OpenFoam-extend-4.0? If I install OpenFoam-extend-4.0 in the same workstation, will the mess up ? My ultimate aim is to install OpenFPCI, which essentially requires both OpenFOAM-Extend and ParaFEM are compiled on the system, using the Open-MPI available on the system.
Any help/suggestion is welcomed.


Thanks!
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Old   November 5, 2019, 15:56
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Quote:
Originally Posted by chandra shekhar pant View Post
Dear All,


In this regard I have a query, I already have OpenFoam 19.06, do I need to install OpenFoam-extend-4.0? If I install OpenFoam-extend-4.0 in the same workstation, will the mess up ? My ultimate aim is to install OpenFPCI, which essentially requires both OpenFOAM-Extend and ParaFEM are compiled on the system, using the Open-MPI available on the system.
Any help/suggestion is welcomed.


No, that won't be a problem. All FOAM variants can be installed and coexist peacefully. You initialise which one to use by sourcing the bashrc file in the etc folder of the respective installation.


E.g. (on bash)

Code:
. ./openfoam-1906/etc/bashrc
will read the config file for OF1906 and set all the environment variables accordingly.

Code:
 . ./foam-extend-4.0/etc/bashrc
will do the same for foam-extend.

If I understand correctly you want the system-OpenMPI library to be used. Usually FOAM will bring it's own OpenMPI and use that (to avoid incompatibilities). But you can compile it using the systemwide OpenMPI lib:

Make sure you have the development package installed (usually openmpi-devel or openmpi-dev, depending on your distribution) and edit the bashrc of the FOAM installation (before starting the compilation). Look for

Code:
# WM_MPLIB = SYSTEMOPENMPI | OPENMPI | MPICH | MPICH-GM | HPMPI | GAMMA | MPI | QSMPI | MVAPICH2
: ${WM_MPLIB:=OPENMPI}; export WM_MPLIB
and change it to


Code:
# WM_MPLIB = SYSTEMOPENMPI | OPENMPI | MPICH | MPICH-GM | HPMPI | GAMMA | MPI | QSMPI | MVAPICH2
: ${WM_MPLIB:=SYSTEMOPENMPI}; export WM_MPLIB
before compiling. Note: I had to provide a link libmpi.so.1 pointing to libmpi.so (in the system library folder), since FOAM did expect libmpi.so.1
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Old   November 5, 2019, 15:58
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Quote:
Originally Posted by chandra shekhar pant View Post
Dear All,


In this regard I have a query, I already have OpenFoam 19.06, do I need to install OpenFoam-extend-4.0? If I install OpenFoam-extend-4.0 in the same workstation, will the mess up ? My ultimate aim is to install OpenFPCI, which essentially requires both OpenFOAM-Extend and ParaFEM are compiled on the system, using the Open-MPI available on the system.
Any help/suggestion is welcomed.

Thanks!

Actually, you are not allowed to say "OpenFOAM-extend", it's "foam-extend" only ;-)
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Old   Yesterday, 11:00
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Thanks Torsten Schenkel for your help, that's really great!
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