Option Rothalpy in Star CD
 

Actually, im modelling a part of centrifugal compressor with a blade of impeller and a vanless diffussor. I've chosen the option " conservation of rothalpy" for thermal model and "Implicit multiple rotating frames". But I 've obtained a wrong results of temperature: temperature at outlet is smaller than one at inlet. It's unphysical.
Some one of you can give me an advice in this case?