# FRICTION FACTOR TURBULENT PIPE and ROUGHNESS

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 July 30, 2007, 15:11 FRICTION FACTOR TURBULENT PIPE and ROUGHNESS #1 beginner Guest   Posts: n/a Hello everybody, I made a modelisation with the following parameters and i try to get the the skin friction factor in the lenght of the pipe this for different roughness. 3D inlet 0.015 m/s D= 1m L=20m water -> Re=15 000 symmetry pipe divided into two part. Trying different times with : Solver K-epsilon: Ks=5e-5 -> Cf=1.5e-3 f=4*Cf=6e3 Ks=2e-2 idem same value for Cf I mean that the cavities of the roughness has an average diameter equal to 5e-5 m or 2e-2m. whereas i expect according MOODY diagramme f=1.8e3 I try with omega model i get a different Cf but still similar for the model. I make maybe a misunderstanding with Ks; If somebody would have a suggestion i would be very helpful. BB

 July 30, 2007, 15:16 Re: FRICTION FACTOR TURBULENT PIPE and ROUGHNESS #2 beginner Guest   Posts: n/a not helpful but grateful thanks in advance; sorry little mistake Ks=5e-5 -> Cf=1.5e-3 f=4*Cf=6e(-)3 Ks=2e-2 idem same value for Cf

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