wall function tutorial,doc,v&v missing

[bigfooted]

Is your feature request related to a problem? Please describe. A clear and concise description of what the problem is. Ex. I'm always frustrated when [...] This is a reminder for me that there is still no tutorial, documentation and V&V for wall functions.

Describe the solution you'd like A clear and concise description of what you want to happen.

1. Add the Stanford diffuser case with wall functions as a tutorial to the website
2. Add a wall function solution to the V&V for the flat plate
3. Update documentation for wall functions

Describe alternatives you've considered A clear and concise description of any alternative solutions or features you've considered.

Additional context Add any other context or screenshots about the feature request here.

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. If this is still a relevant issue please comment on it to restart the discussion. Thank you for your contributions.

[bigfooted]

tutorial for the 90 degree pipe bend is almost finished

[bigfooted]

tutorial for the pipe is finished