Medio is a library designed to facilitate the input and output of mesh files for FreeFEM in the med format, which is the native mesh format utilized by SALOME, an open-source pre/post-processing tool known for its robust capabilities in computational engineering and simulation.

Medio bridges the gap between FreeFEM and SALOME, enabling seamless data exchange and promoting interoperability between these powerful tools.

Dependencies

To compile and use Medio, you will need the following dependencies:

• FreeFEM (version 4.13)
• MedCoupling (version 9.12)
• MPI

Compilation

Compilation with precompiled MedCoupling (install procedure 1)

Below, we present a step-by-step guide on how to compile and install Medio with precompiled MedCoupling support for FreeFEM:

Prepare the Build Configuration:

Run the following command to prepare the build configuration:

autoreconf -i

Configure the Build:

Now, let's configure the build by specifying the necessary options using the configure script:

./configure \
--prefix=/home/Work/tmp/medio \
--with-medcoupling=/home/Install/TarPackages/SALOME-9.12.0-native-UB22.04/BINARIES-UB22.04/MEDCOUPLING \
--with-medfile=/home/Install/TarPackages/SALOME-9.12.0-native-UB22.04/BINARIES-UB22.04/medfile         \
--with-hdf5=/home/Install/TarPackages/SALOME-9.12.0-native-UB22.04/BINARIES-UB22.04/hdf5

In this configuration:

• medio will be installed in the /home/Work/tmp/medio/lib directory. You can choose a directory that you wish to install medio.
• The root directories for medcoupling , medfile, and hdf5 which come as precompiled with SALOME are provided /home/Install/TarPackages/SALOME-9.12.0-native-UB22.04/BINARIES-UB22.04/. To get your precompiled SALOME click here.
• To proceed with the build, ensure that FreeFEM is already installed and available in your $PATH. If not use flag --with-FreeFEM to configure with FreeFEM installed elsewhere.

Please note you will need to adapt each flag to your specific system.

Compile medio:

With the configuration set, it's time to compile medio and make sure it is ready for use:

make

Install medio:

Once the compilation process is successful, proceed to install medio using the following command:

make install

By following these steps, you should have successfully compiled and installed medio linked with precompiled MedCoupling support for FreeFEM.

Compilation with MedCoupling (install procedure 2)

Here is a step-by-step guide for the typical compilation process:

Prepare the Build Configuration:

Begin by running the following command to set up the build configuration:

autoreconf -i

Configure the Build:

Next, use the configure script to configure the build with the required options:

./configure \
--prefix=/home/Work/tmp/medio \
--with-dependencies

In this configuration:

• medio will be installed in the /home/Work/tmp/medio/lib directory. You can choose a directory that you wish to install medio.
• After successfull install, the root directories for medcoupling, medfile, and hdf5 will be automatically located in ext/MEDCOUPLING-9.12.0-MPI/INSTALL.
• Ensure that FreeFEM is already installed and available in your $PATH. If not use flag --with-FreeFEM to configure with FreeFEM installed elsewhere.

Compile medio:

With the configuration set, it's time to compile medio and make sure it is ready for use:

make

Install medio:

Once the compilation process is successful, proceed to install medio using the following command:

make install

By following these steps, you should have successfully compiled and installed medio linked with MedCoupling support for FreeFEM.

Check the compilation

To ensure a successful compilation, you can run the following command to perform checks:

make check

Note

to use and run medio please make sure that your $LD_LIBRARY_PATH variable contains medcoupling, medfile, and hdf5 paths. For example for the install above

export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/home/Install/TarPackages/SALOME-9.12.0-native-UB22.04/BINARIES-UB22.04/MEDCOUPLING/lib:/home/Install/TarPackages/SALOME-9.12.0-native-UB22.04/BINARIES-UB22.04/medfile/lib:/home/Install/TarPackages/SALOME-9.12.0-native-UB22.04/BINARIES-UB22.04/hdf5/lib

By following these steps, you will have successfully compiled and installed Medio with MedCoupling support for FreeFEM, allowing smooth mesh file handling and data exchange between FreeFEM and SALOME. Don't forget to set the necessary environment variables to ensure seamless operation. Enjoy utilizing the power and efficiency of medio in your computational simulations!

Examples

Example 1: saving the med mesh

savemedmesh([MESH], [STRING]) used to save two-dimensional (mesh), three-dimensional (mesh3), three-dimensional surfasic(meshS), three-dimensional curve (meshL) meshes from FreeFEM. Simple example is shown for two-dimensional (mesh) case, the same logic works for others. find more examples in test/FreeFEM/Test_1.edp

load    "medio";               // load medio lib
mesh Th = square (12,12);      // 2D mesh 
savemedmesh(Th, "test2D.med"); // save to med format 

Example 2: loading the med mesh

[MESH] = loadmedmesh([STRING], meshname = [STRING]) used to load two-dimensional (mesh), three-dimensional (mesh3), three-dimensional surfasic(meshS), three-dimensional curve (meshL) meshes from FreeFEM. Simple example is shown for two-dimensional (mesh) case, the same logic works for others. find more examples in test/FreeFEM/Test_2.edp

load    "medio";               // load medio lib
mesh Th = square (31,1);
savemedmesh(Th, "test2DLoad.med");
Th=loadmedmesh("test2DLoad.med", meshname = "TriangularMesh");
plot (Th,wait=1);

Example 3: getting boundary tags via group names

For any finite element mesh SALOME lets you create groups which can be named [STRINGS] so that boundary conditions or other conditions (initilization, multi-material..) can be applied upon these during solving. However within FreeFEM world these groups are represented by [INTEGER] tags. medio function getMedLabelsOnGroup(INT[INT], [STRING],[STRING]) provides interface so that [STRING] group lables can be used in FreeFEM. As an example

load    "medio";               // load medio lib
int[int] labelMed;
getMedLabelsOnGroup( labelMed,"test2DLoad.med","edge_group_1");
cout << labelMed << endl;

varf Dirichlet(u,v) = on(labelMed, u =0);