Numerical Analysis of the High Speed Driven Cavity Flow in 2-D Curved Channel

Numerical experiments were carried out on the high speed driven cavity flows in 2D curved channels to investigate mainly the pressure field. A density-based algorithm in ANSYS Fluent 13.0 was used in the present URANS simulations. The SST k-w model was used for modeling the turbulence within an unstructured mesh solver. Validation of the numerical code was accomplished, and the results showed a good agreement between the numerical simulation and experimental data. Three channels (straight, concave and convex) with a nominal height of H = 4 ×10^-3 m under the transonic flow conditions were considered in the study. The cavity studied is L = 12×10^-3 m long with the depth ranging from D = 12×10^-3 m to 48×10^-3 m to obtain the length-to-depth ratios of L=D=1 to 1=4. The study comprised the analysis of the cavity surface pressures and the associated flow structures. The channel configuration influenced the cavity flowfield, and that influence finally resulted in a change in the surface pressure fluctuations in the cavity. The deep cavity attenuated the flowfield oscillation inside the cavity.