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:
initial conditions
boundary conditions
free slip and no-slip boundary conditions
and how to non-dimensionalize the Navier-Stokes equations.
It has nothing to do with bubbles. You have a viscous fluid inside a container, which is set into motion by moving the top lid with a certain velocity. It is a good test for numerical solvers because of the low velocity recirculation areas that appear close to the bottom corners.