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Eﬀect of turbulence model, turbulence length scale and wall roughness on the laminar-turbulence transition and temperature distribution of a convectively cooled C3X turbine vane

Banaś K., Badur J.

Transactions of the Institute of Fluid-Flow Machinery

2017

nr 138

13--32

Our paper demonstrates the ability of Favre-averaged Navier–Stokes (FANS) turbulence models to predict the laminar-turbulent transition and shows the inﬂuence of the models on the wall temperature distribution. The investigations were based on conjugate heat transfer analyses of a convectively cooled C3X turbine vane, which were performed using commercial ﬂow simulation software. We compared several eddy-viscosity models: shear stress transport (SST), γ-Reθ SSTtransition, v2-f, k-ε, realizable, k-kl-ω transition, and second-order closure ε-based Reynolds stress model (RSM) with a linear pressure-strain model. The turbulence length scale (TLS) was not measured during the experiment, so its inﬂuence on the location of the transition onset and wall temperature distribution is presented. We also examined the inﬂuence of the roughness of the airfoil wall on the location of turbulence initialization and the wall temperature distribution.