Case Name .foam File
From OpenFOAMWiki
Description
This is a blank file. It gets created so that Paraview has a file to fix on for its open command. Paraview knows that the OpenFOAM data is in a directory structure. But Paraview is a generalized visualization program, and most of the other file formats have everything contained within a single file. So to match Paraview's expectations, there must be some file in the root of your case directory with the extension .foam. The file can be empty. It doesn't matter what is in it, and it doesn't matter what the filename is. But it must end with the extension .foam
