An efficient finite-volume numerical method, based on the artificial-compressibility approach, is developed for solving the unsteady three-dimensional incompressible Navier-Stokes equations. The divergence-free constraint is satisfied at every instant in time using an explicit, multistage, dual time-stepping procedure enhanced with local tune-stepping, implicit residual smoothing, and multigrid acceleration. The method is applied to simulate unsteady vortex breakdown in confined swirling flows. Results are presented for the so-called Esqudier cylinder, a closed cylindrical container with one rotating endwall, and swirling flow through a straight circular diffuser. Comparisons of the computed results with available flow visualization experiments demonstrate the ability of the method to resolve and clarify several aspects of vortex breakdown previously observed in the laboratory.
|Original language||English (US)|
|State||Published - Jan 1 1997|
|Event||Proceedings of the 1997 ASME Fluids Engineering Division Summer Meeting, FEDSM'97. Part 16 (of 24) - Vancouver, Can|
Duration: Jun 22 1997 → Jun 26 1997
|Other||Proceedings of the 1997 ASME Fluids Engineering Division Summer Meeting, FEDSM'97. Part 16 (of 24)|
|Period||6/22/97 → 6/26/97|