Volumetric entropy production in fluent
 

I'm trying to obtain results published in a certain paper for SST k-omega turbulence simulation through a tube. They calculated the volumetric entropy generation using
https://i.ibb.co/SQKrmSN/2023-11-27-17-47-32.png
where
https://i.ibb.co/xDnDT8d/2023-11-27-17-47-34.png
https://i.ibb.co/nQgwr6r/2023-11-27-17-47-35.png
and the fluctuation components are defined in terms of $k$ and $\omega$. I'm not sure how to implement this in Fluent. They stated that calculations are based on Fluent. Will appreciate any help.