This preprocessing training tutorial shows a complete process of CFD workflow on a simple geometry of a cyclone separator. The very first step is a creation of a CAD model in SALOME from scratch. Afterwards, the surface model exported. The surface model can be either used to create a computational mesh in OpenFOAM using snappyHexMesh. Or the computational mesh can be generated directly in SALOME and can be converted to OpenFOAM mesh format.