A full-3D unstructured solver is applied for the investigation of the physics involved in the flow of modern film cooling devices. The numerical simulation is based on a TVD upwind finite volume method that exploits the implicit time-marching approach. A conventional two equations eddy viscosity closure is considered for the turbulent flow field without wall-functions. The present application aims to investigate and discuss the flow field physics as obtained from a numerical RANS (Reynolds Averaged Navier-Stokes) simulation comparing different cooling duct systems devices. The CFD outcome is discussed against experiments considering the discharge coefficient as a means to quantify the accuracy of the numerical simulation. Particular attention is focused on the geometrical discretization, on the grid characteristics and on the capabilities of CFD for an efficient and realistic modelling of the flow field. The basic features of the film cooling technique are addressed considering the experimental test configurations investigated by Karlsruhe University for cylindrical, fanshaped and laid back fan shaped configurations with cross/parallel flows arrangement.

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