hi viola,
I struggled a bit with that issue too.
If you are using butterfly vers. 0.0.04 and followed @devang post (Installation Error OpenFoam Windows 10 ) to update butterfly to his last version available only on Github, you don’t have the meshparm input in «creatcasefortunnel» component anymore.
You simply have to do the case grading part in the second component (blockmesh). Now if you begin with this plugin, so do I, this is where this new butterfly version is really helpfull. You don’t have to calculate the grading yourself with the gradingXYZ component. Instead just use the butterfly_windtunnelgrading component. It will calculate it for you. (But you can still use the manual grading by plugin it into the _gradXYZ from blockmesh component.
01_0_outdoor_airflow.gh (439.4 KB)
hope it helps
Best,
Charles C.
OpenFOAM 1706 // VM 5.2.8