ON THE NAVIER-STOKES CALCULATION OF SEPARATION-BUBBLES WITH A NEW TRANSITION MODEL

Laminar separation bubbles are commonly observed on turbomachinery bla des and therefore require effective methods for their prediction. Ther efore, a newly developed transition model by Gostelow et al. (1996) is incorporated into an upwind-biased Navier-Stokes code to simulate lam inar-turbulent transition in the boundary layer. A study of the influe nce of the two adjustable parameters of the model, the transition onse t location and the spot generation rate, is conducted and it is found that it can predict laminar separation bubbles, measured on a NACA 001 2 airfoil. Additional results are presented for separation bubbles in an annular compressor cascade.