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Center for Turbulence Research Annual Research Briefs 2005

Summary: Center for Turbulence Research
Annual Research Briefs 2005
Large-scale integrated LES-RANS simulations of a
gas turbine engine
By J. Schl¨uter, S. Apte, G. Kalitzin, E. v. d. Weide, J. J. Alonso AND H. Pitsch
1. Motivation and objectives
Today's use of Computational Fluid Dynamics (CFD) in gas turbine design is usually
limited to component simulations. The demand on the models to represent the large
variety of physical phenomena encountered in the flow path of a gas turbine mandates
the use of a specialized and optimized approach for each component.
The flow field in the turbomachinery portions of the domain is characterized both by
high Reynolds-numbers and by high Mach-numbers. The accurate prediction of the flow
requires the precise description of the turbulent boundary layers around the rotor and
stator blades, including tip gaps and leakage flows. A number of flow solvers that have
been developed to deal with this kind of problems have been in use in industry for many
years. These flow solvers are typically based on the Reynolds-Averaged Navier-Stokes
(RANS) approach. Here, the unsteady flow field is ensemble-averaged, thereby removing
all dependence on the details of the small scale turbulence. A turbulence model becomes
necessary to represent the portion of the physical stresses that has been removed during


Source: Apte, Sourabh V. - School of Mechanical, Industrial, and Manufacturing Engineering, Oregon State University


Collections: Engineering