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- W2113899268 abstract "The present paper investigates the multigrid (MG) acceleration of compressible Reynolds-averaged Navier–Stokes computations using Reynolds-stress model 7-equation turbulence closures, as well as lower-level 2-equation models. The basic single-grid SG algorithm combines upwind-biased discretization with a subiterative local-dual-time-stepping time-integration procedure. MG acceleration, using characteristic MG restriction and prolongation operators, is applied on meanflow variables only (MF–MG), turbulence variables being simply injected onto coarser grids. A previously developed non-time-consistent (for steady flows) full-approximation-multigrid (s–MG) is assessed for 3-D anisotropy-driven and/or separated flows, which are dominated by the convergence of turbulence variables. Even for these difficult test cases CPU-speed-ups rCPUSUP∈[3, 5] are obtained. Alternative, potentially time-consistent approaches (unsteady u–MG), where MG acceleration is applied at each subiteration, are also examined, using different subiterative strategies, MG cycles, and turbulence models. For 2-D shock wave/turbulent boundary layer interaction, the fastest s–MG approach, with a V(2, 0) sawtooth cycle, systematically yields CPU-speed-ups of 5±½, quasi-independent of the particular turbulence closure used. Copyright © 2008 John Wiley & Sons, Ltd." @default.
- W2113899268 created "2016-06-24" @default.
- W2113899268 creator A5018475341 @default.
- W2113899268 creator A5056222323 @default.
- W2113899268 date "2009-09-20" @default.
- W2113899268 modified "2023-09-23" @default.
- W2113899268 title "Implicit meanflow-multigrid algorithms for Reynolds stress model computation of 3-D anisotropy-driven and compressible flows" @default.
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