Error in Fluent ?
 

Dear all

I am simulating flow in a turbine rotor. when I am using the specific heat value typical of STP conditions, I am getting correct values of turbine performance (efficiency) in turbo report panel. but as i change the value to any other value i get the resutls with 12-15% deviation. Is there any error in Fluent.

Can any body suggest me that how the fluent calculate the efficiency for constant and variable gas properties.

Thanks