Abstract
Large Eddy Simulation (LES) of isothermal flow in stationary and wall-normal rotating blade internal cooling system is evaluated against experimental data. The studied case is a 3D one wall ribbed straight channel for which time resolved two-dimensional Particle Image Velocimetry (PIV) measurements have been performed at the Von Karman Institute (VKI) in a near gas turbine operating condition. Thanks to these experimental mean and time-resolved quantities, advanced numerical computations can be adequately evaluated. In this work LES results show that this high fidelity CFD model is able to reproduce the turbulence increase (decrease) around the rib in destabilizing (stabilizing) rotation of the ribbed channel. Such effects are not only captured at the mean level but also at the unsteady level as confirmed by the comparison of the LES large-scale coherent motions with these obtained by PIV.
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