... turbulence model, which blends the k – ɛ and k – ω models. This is achieved by blending the turbulence model closure coefficients from the k – ɛ values in the freestream to the k – ω values near the wall. The model also includes a limiter on μ t , to account for the transport of the principal...

...Xiao He; Fanzhou Zhao; Mehdi Vahdati The Spalart–Allmaras (SA) turbulence model is one of the most popular models applied to compressors, but it often over-predicts blockage size and hence under-predicts the stall margin. In this paper, a novel modification to the SA model is proposed to improve...

... turbulence production rates, elucidating the different mechanisms involved and providing a unique database for turbulence modeling. Interaction of the tip flow with the ACGs modifies the highly anisotropic and inhomogeneous passage turbulence. In all cases, the TKE is high in the TLV center and shear layer...

...David Roos Launchbury; Luca Mangani; Ernesto Casartelli; Francesco Del Citto In the industrial simulation of flow phenomena, turbulence modeling is of prime importance. Due to their low computational cost, Reynolds-averaged methods (RANS) are predominantly used for this purpose. However, eddy...

...Xiao He; Fanzhou Zhao; Mehdi Vahdati The turbulence model in Reynolds-averaged Navier–Stokes simulations is crucial in the prediction of the compressor stall margin. In this paper, parametric uncertainty of the Spalart–Allmaras turbulence model in predicting two-dimensional airfoil stall and three...

... and film cooling turbulence modeling machine learning Gas turbine blades operate in extremely high-temperature environments, and thus require well-engineered cooling techniques to meet desired lifespans. Discrete hole film cooling is one such technique [ 1 ] in which a coolant (usually air...

... is a significant challenge when applying Reynolds averaged Navier–Stokes turbulence modeling techniques. The current study compares the steady-state mixing plane predictions using four turbulence models for a centrifugal compressor stage with a tandem impeller and a “fish-tail” style discrete passage diffuser...