# The Pressure Loss in a Straight Pipe

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 April 5, 2007, 09:31 The Pressure Loss in a Straight Pipe #1 Andy Cong Guest   Posts: n/a Dear all, I have suffered a simple problem now. I simulate a simple pipe flow with a pipe length of 1m, diameter of 0.4m, and a roughness height of 0.0005m. The inlet velcoity is 0.2533m/s. The pressure loss what Fluent gets is 1.58e-3 m(unit with water high). But the pressure loss gotten by Darcy equation is 1.53e-4 m. So big different between the CFD and tranditional method. Could anyone can advise me?? Thank you very much. Andy

 April 5, 2007, 10:23 Re: The Pressure Loss in a Straight Pipe #2 julian Guest   Posts: n/a What are your inlet and outlet boundary conditions, and how do these compare to the assumptions in the method of hand calculation? Have you a flat velocity profile and an outlet, ot are you using twu developed flow profiles? DOes the correlation allow for flow development? What is your y+ and are you accurately modelling what happens at the wall. Have you static as well as frictional losses to account for? What if you create a 10m long pipe and look atthe pressure loss between 8 and 9m. Are you sure that the roughness is inputted correctly and that you have converted it to mm in the correlation?

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