# Periodic BC on Inlet and Outlet of a Duct

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 July 20, 2005, 14:37 Periodic BC on Inlet and Outlet of a Duct #1 Steve Guest   Posts: n/a Hi I was wondering if anyone has experience with applying periodic boundary conditions to the inlet and outlet of a duct, ie making the pipe infinitely long to obtain fully developed flow. I am using TASCflow v.2.12 and it does not like to apply the periodic condition as well as the inlet or outlet condition. Is there a method to get around this problem, possibly to apply a pressure gradient over the duct or define the mass flow rate not directly on the inlet or outlet? Thanks in advance Steve

 July 21, 2005, 08:27 Re: Periodic BC on Inlet and Outlet of a Duct #2 stex Guest   Posts: n/a Create a subdomain ---> momentum source Momentum source is like a (DeltaP/L). Good luck. Ask me if you are in trouble. Bye

 August 8, 2005, 12:03 Periodic BC on Inlet and Outlet of a Duct #3 A.W. Guest   Posts: n/a Hi, I have a problem in implementation of periodic boundary condition in a duct for a turbulent flow. The way I apply it is: copying outlet velocity multiplying by a factor (for correcting mass) to the inlet and copying pressure at 65% of length of the domain -(Pave at this cross section=65% of domain) to the outlet. I don't know if it is correct. I know there is another popular method : using the (dp/L=-4*Tauw/Dh) as a momentum source in streamwise direction and copying velocity and pressure to the inlet or outlet. But I can't understand this method. I really appreciate if someone can help me. Thanks in advance, A.W.

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