[mhakimakbar]

I'm doing a simulation in fluent for a radial outflow turbine. I use n-pentane as a working fluid.
I set the inlet BC with pressure-inlet type p=12 bar T=136C and the outlet BC with pressure-outlet type p=0.3 bar T=52C.

After the simulation I get the mass flow rate 1.039 kg/s from Reports>Fluxes>Mass Flow Rate for both inlet and outlet.
Then I calculate the pressure and temperature for both inlet and outlet from Reports>Surfaces Integral>Area-weighted Average
After that I calculate the turbine power, W = m*(h inlet - h outlet) = 25.4 kW

But when I calculate the power from moments and turbine angular velocity, I just get 3.285 kW.
I get the moment from Reports>Forces>Moments is 5.22 Nm and the angular velocity from my cell zone conditions 6000rpm.
W = moment*rpm = 3.285 kW

I expect the turbine power to be 3-5 kW, so I assume fluent reports a wrong mass flow rate.
What does mass flow rate mean in fluent?