Personally I find these kind of topics fascinating and the scientific/numerical domain knowledge that people bring to the Julia forum is what makes it really interesting, not just another programming forum. So thanks for what you’ve posted so far; I for one appreciate it being posted publicly.
I’d also point out that discourse gives fairly powerful tools for people to mute threads they don’t find interesting.
I am currently working on CFD and full potential solver using my geometric algebra foundation Grassmann.jl. Will take a look at your work as well, but will not be contributing because I am developing a universal foundation for CFD based on geometric algebra from scratch and have my own repositories for that. Also solved the lid cavity problem already as well. Don’t know much about multi grid, I’m still learning. If anyone is interested in using Grassmann as the geometric foundation for CFD, let me know.