Documentation of Boundary condition

[gargtarang]

Hello Prof White,

I am currently learning dsmc simulation using this code and Bird's book, however, I am finding difficulties in using boundary conditions. Almost all boundary condition header files show same description and it's difficult for me to understand its behavior from the code. I was wondering if it would be possible for you to update the boundary condition description a little bit so to understand its purpose or some reference from where I can be looked upon.

-Tarang