I need some clarifications on The Lid-Driven Cavity Problem.
What does it actually mean? I know cavities are bubbles created when a fluid moves through liquid in low pressure zones, but what does the lid-driven cavity actually mean in context? Are we saying we take the bubbles to be of a square cavity? And also, that the lid is the upper part of the square, where the other three sides are no-slip conditions, correct?
I also need more clarifications on:
free slip and no-slip boundary conditions
and how to non-dimensionalize the Navier-Stokes equations.