cavity.OpenFOAM file empty, what to do?

Question

I'm trying to learn how to use OpenFOAM. To do so, I'm working my way through the cavity example, found here:

https://cfd.direct/openfoam/user-guide/v8-cavity/

In step 2.1.2 Viewing the mesh I run paraFoam and a window opens called ParaView 5.6.0 64-bit. The render view of the window is empty (see screenshot). I expect to see a mesh here, as shown in the tutorial. I cannot select a coloring in the window, because the Display tab is empty, even when I click the little cog wheel at the top of the tabs.

I found that the file cavity.OpenFOAM, which is generated by paraFoam, is empty, i.e. it has zero bytes.

$ icoFoam -help
[...]
Using: OpenFOAM-7 (see https://openfoam.org)
Build: 7-1ff648926f77

Answer 1

cavity.OpenFOAM is always a 0 byte file.

• In ParaView make sure to select the required Mesh Parts before you hit apply. select Mesh Parts'
• After hitting apply, change the view from 'Surface' to 'Surface With Edges Surface With Edges