[medguedem]

hello;
I have modelled a 3d pipe in Gambit and Fluent To validate the results I dont know how can I calculate the friction factor in the pipe.as (L. F. Moody diagram, "Factors of friction for the flow of the pipes).
There are so many threads in cfd-online , but there is not any satisfying response.
I am looking for a tutorial or youtub that have to calculate the friction factor and how i can to calculate the shear stress?
I know the theoretical formulas of coeifficient of friction and pressure, but the problem that remains posed is the tool of the simulation fluent ansys I have not succeeded to find the exact value of friction and the hydraudynamic force of our simulation. I need tutorial or steps followed to calculate the friction factor and u* the friction velocity (u* = √τ w/ρ ) and Nikuradse formule
1/√f=-0.861ln[(ε/D)/3.7+2.21/Re√f]
please specifics
the geometry is attached below

[LuckyTran]

You can get the wall shear stress from surface integrals or a report. But you ask for a youtube video and I don't have one. Sorry I can't help any more than this.