I regularly convert Fluent meshes to OpenFOAM using

fluent3DMeshToFoam

- what error did you struggle with? - My normal procedure is: 1. save Fluent mesh in legacy format WITHOUT binaries (.msh.gz) 2. unzip using

gunzip

(2b. adjust mesh file in case of non-ordinary patches such as periodic) 3. convert with

fluent3DMeshToFoam