[rahulv]

Hi

I want to predict pressure drop over a model on a given flow rate.
For benchmarking i took the cylinderical pipe and study the pressure drop for laminar and turbulent flow at various Re.
i am trying to calculate fricition factor from moody chart (f=64/Re for laminar flow) and comparing it with cfx ( f = -(dp/dx)(2d/(rho*V^2)).

but cfx friction factor is almost double in all the cases. i am could not find reason behind it.

my BC

inlet- mass flow rate (based on Re)
outlet- static pressure =0

Thanks and Regards
rv