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The Pressure Loss in a Straight Pipe

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Old   April 5, 2007, 08:31
Default The Pressure Loss in a Straight Pipe
Andy Cong
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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.

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Old   April 5, 2007, 09:23
Default Re: The Pressure Loss in a Straight Pipe
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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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