Preconditioning for numerical simulation of low mach number three-dimensional viscous turbomachinery flows

Daniel L. Tweedt, Rodrick V. Chima, Eli Turkel

Research output: Contribution to conferencePaperpeer-review

Abstract

A preconditioning scheme has been implemented into a three-dimensional viscous computational fluid dynamics code for turbomachine blade rows. The preconditioning allows the code, originally developed for simulating compressible flow fields, to be applied to nearly-incompressible, low Mach number flows. A brief description is given of the compressible Navier-Stokes equations for a rotating coordinate system, along with the preconditioning method employed. Details about the conservative formulation of artificial dissipation are provided, and different artificial dissipation schemes are discussed and compared. The preconditioned code was applied to a well-documented case involving the NASA large low-speed centrifugal compressor for which detailed experimental data are available for comparison. Performance and flow field data are compared for the near-design operating point of the compressor, with generally good agreement between computation and experiment. Further, significant differences between computational results for the different numerical implementations, revealing different levels of solution accuracy, are discussed.

Original languageEnglish
StatePublished - 1997
Event28th Fluid Dynamics Conference, 1997 - Snowmass Village, United States
Duration: 29 Jun 19972 Jul 1997

Conference

Conference28th Fluid Dynamics Conference, 1997
Country/TerritoryUnited States
CitySnowmass Village
Period29/06/972/07/97

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