The DLR internal Project HEAT investigates the thermal budget of turbine blades.
The detailed description of the project can be found here: http://www.dlr.de/at/desktopdefault.aspx/tabid-8747/15079_read-37361/
Numerical Methods in HEAT
Within the project “HEAT” the ability of TRACE predicting heat transfer coefficients has been evaluated in detail for internal and external turbine flow. Potential for improvement has been found where thermal and velocity boundary layer evolves in a different way.
The state-of-the-art in calculating turbulent heat flux is to combine an eddy viscosity transport model with the Reynold’s analogy. The assumption is that turbulent heat flux can be obtained from eddy viscosity by using a constant factor. Thus the Reynold’s analogy always leads to similar fields of turbulent heat and momentum flux.
For overcoming this restriction and further improving solution accuracy, within the HEAT project an autonomous two equation transport model for turbulent heat flux is developed. Compared to calculations based on the Reynold’s analogy it is expected that significant differences can be found in separated boundary layers and free shear layers.