Designing a turbine stage is a multidisciplinary process. Structural and aerodynamic as well as thermal engineering limitations have to be considered while finding an optimal shape and material. Thus, precise knowledge of material temperatures is crucial for the entire design process. Depending on the operation point, the temperature of turbine material results from gas temperatures as well as inner and outer surface heat transfer rates. A lot of experience exists using TRACE to solve the external flow around a turbine blade. At the moment efforts are made to be able to do internal cooling channel design in TRACE in the future. The heated wall with ribs is a typical example for a flow regime in a cooling channel. Ribs cause a separation of the boundary layer and thus increase the heat transfer rates. These flow regimes are unsteady and highly three-dimensional. Predicting flow in such geometries is a challenging task for a RANS-solver like TRACE. For calculating the distribution of heat transfer rates on wall with ribs (figure on the right side) modern transport models for turbulent momentum and heat transfer are applied in combination with preconditioning techniques. A typical example for external flow around a turbine blade is the transonic cascade VKI LS 89(figures on the right side). With Reynolds numbers ranging from 600.000 to 2.000.000 and turbulence intensities from 1% to 6% and measurement of heat transfer and pressure distribution a large database exists.