Response of Simple Turbulence Models to Step Changes of Slip Velocity

A numerical study was performed of two turbulent boundary layers with sudden changes of the slip velocity at the wall. The first is the two-dimensional flow on a flat plate with a sudden increase of the wall velocity. The second flow is a three-dimensional boundary layer along a cylinder whose upstream section is rotating with a constant circumferential velocity, while the downstream section remains still. Computations were carried out with a wide range of simple eddy-viscosity models: an algebraic model, two one-equation models, a two-equation κ-e model, and a zonal κ-ω model