... kinetic energy , which allows the increase in the nonturbulent fluctuations in the pretransitional and transitional region to be taken into account. The model is derived from that of Lardeau et al. (2004, “Modelling Bypass Transition With Low-Reynolds-Number Non-Linear Eddy-Viscosity Closure,” Flow...

... of stator-related effects at the rotor exit is encountered when the stator incidence is increased as a result of the different mixing rate within the cascade gap. 18 07 2007 04 04 2008 08 04 2009 aerodynamics blades viscosity The flow downstream of a subsonic turbine cascade...

... are spread to the discharge nozzle; the pressure fluctuations are also reflected to the impeller inlet and they affect the mass flow rate through the blade passages. computational fluid dynamics flow simulation viscosity rotational flow pressure nozzles Contributed by the International Gas...

... to the local flow conditions, uses the most suitable fluctuation splitting (FS) scheme at each cell of the computational domain. The viscous terms are discretized using a standard Galerkin finite element scheme. The eddy viscosity is evaluated by means of the Spalart-Allmaras turbulence transport equation...

... measurement viscosity compressors aerodynamics supersonic flow computational fluid dynamics turbulent diffusion The work reported here constitutes one element of a program being conducted by the MIT Gas Turbine Laboratory and its collaborators to develop and validate the technology for design...

... ) ∇ P where μ is the dynamic viscosity of the fluid. Substituting Eq. 5 in Eq. 4 thus yields 6 ∇ ∙ ( ρ h 3 12 μ ∇ P ) = − ∑ i = 1 N Q i δ ( r ⃗ i ) Assuming an ideal gas and the flow to be isothermal, Eq. 6 becomes 7...

... of the v 2 ¯ − f model is also compared with other eddy-viscosity-based turbulence models, including a version of the v 2 ¯ − f model, available in FLUENT . The importance of preventing unphysical growth of turbulence kinetic energy in stator vane flows, here by use of the realizability constraint...

... fluid dynamics viscosity vortices One of the more significant design trends in recent years is the use of aerodynamic sweep to improve the performance and stability of transonic compressor blades. The experimental and analytical studies of single and multistage fans by Wadia et al. 1 2...

... stators flow simulation viscosity The most significant contribution to the unsteadiness in a turbine is due to the periodic chopping of the wake (Hodson 1 ) and secondary flow vortices from the upstream blade row by the downstream blade row (Chaluvadi et al. 2 3 , Sharma et al. 4 , Boletis...

..., and are consistent with the mass-averaged compressor speedline characteristics generated from the CFD results. 01 10 2003 01 03 2004 13 06 2004 17 06 2004 blades compressors computational fluid dynamics impellers flow instability viscosity optimisation aerodynamics design...

... airfoil conditions. The intermittent behavior of the transitional flows is taken into account and incorporated into computations by modifying the eddy viscosity, μ t , with the intermittency factor, γ. Turbulent quantities are predicted by using Menter’s two-equation turbulence model (SST...

... understanding of the distortion sources and the aerodynamic interaction mechanisms. gas turbines transonic flow computational fluid dynamics classification aerodynamics viscosity wakes flow instability 04 June 2001 24 October 2000 10 07 2002 Contributed...

... and Exhibition, New Orleans, Louisiana, June 4–7, 2001. Manuscript received by the IGTI, January 30, 2001. Paper No. 2001-GT-435. Review Chair: R. A. Natale. 04 June 2001 30 January 2001 10 07 2002 gas turbines flow simulation viscosity compressors decomposition To maintain...

... No. 2001-GT-259. Review Chair: R. A. Natole. 04 June 2001 24 October 2000 10 07 2002 gas turbines aerodynamics transonic flow flow instability viscosity computational fluid dynamics pressure rotors The knowledge of the forcing function, i.e., the Fourier decomposed...

... compressors aerodynamics gas turbines design engineering viscosity instrumentation Application of aero-engine technology to ground-based gas turbines has increased rapidly, especially in the last decade, as documented in the works of Scalzo 1 , Kashiwabara 2 , Sehra 3 . Smed 4 , Janssen 5...

... viscosity-affected layer; 2) inclusion of the anisotropy of turbulent transport coefficients for all transport equations; 3) near-wall variation of the turbulent Prandtl number as a function of the local Reynolds number. Most of the important aspects of the proposed model are based on known DNS statistics...

... March 1993 01 August 2001 flow simulation heat transfer gas turbines rotors flow instability stators aerodynamics viscosity subsonic flow boundary layer turbulence Contributed by the International Gas Turbine Institute and presented at the 38th International Gas Turbine...

... numerically. The Reynolds turbulent stress tensor is calculated by two methods, namely, an eddy viscosity model (EVM) and an explicit algebraic stress model (EASM). The pressure–velocity coupling is handled by the SIMPLEC algorithm and calculations were carried out on a collocated grid. The convection...

... = pressure gradient parameter μ = dynamic viscosity ν = kinematic viscosity σ = turbulent spot propagation rate ϑ = boundary layer momentum thickness, tangential angle Subscripts 1 = inlet 2 = outlet av = averaged e = boundary layer...

... instability viscosity flow simulation Navier-Stokes equations Laplace transforms finite element analysis laminar to turbulent transitions transonic flow Over the last three decades, considerable effort has been devoted to developing computational methods for modeling unsteady turbomachinery...