entrance length and geometry length

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##### Question

Can we use the same length we get from this formula for simulation?

OpenFOAM-version-7 Simulating-Hagen-Poiseuille-flow-through-a-pipe-in-OpenFOAM 02-03 min 30-40 sec

__Answers:__

Yes, You can. But it is always recommended to use longer pipe geometry to get fully developed flow.

Thanks,

Divyesh Variya

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