The implementation of an integral transition model in a parallel unstructured CFD code is described. In particular, an algorithm for gathering the non-local boundary layer values (momentum thickness, shape factor, etc.) from parallely distributed computational domains is presented. Transition modelling results are presented for a flat plate and for a low pressure turbine, covering a large range of Reynolds numbers, Mach numbers, turbulence intensities and incidence angles. The transitional predictions are in much better agreement with the measurements than fully turbulent simulations. Furthermore, the computational overhead of transitional simulations is only 7% for one multigrid cycle.

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