which software you suggest to mesh generating?! independent of meshing tools of softwares like ANSYS or COMSOL. is it possible to import generated mesh to COMSOL or ANSYS?
You can use Altair HyperMesh(https://www.altair.com/hypermesh/) for meshing (Free student's licensse is available on Altair University site: https://altairuniversity.com/free-altair-student-edition/ ).
I think you can't import complate mesh into the comsol software you can import the file and mesh it in, but it possible import mesh in ansys( you can use gambit software for meshing & import to ansys)
In my opinion, for structural analysi, Hypermesh ( one of Altair Hyperwork's softwares ) is the best.
Ansys meshing is in 2nd rate.
About import or exporting mesh from one software to another, yes it can be done and many advanced user import mesh from hypermesh to another softwares.