# What is Periodic condition??

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 April 9, 2008, 05:10 What is Periodic condition?? #1 vijay Guest   Posts: n/a Dear friends, I am trying to simulate "flow over an infinite flat plate". I am taking a plate of unit width. I think I have to use "interface domain" BC to solve this. It asks to specify 2 regions in that. I have (a)inlet (b)outlet (c)symmetry & (d)wall-no slip boundary conditions. (c) & (d) are in between (a) & (b). Questions: Which boundary is periodic?? Which regions I have to specify for "interface domain" as region-1 & region-2 ? At the same time, I have some known velocity at the inlet. Plz reply.

 April 9, 2008, 06:12 Re: What is Periodic condition?? #2 Usman Guest   Posts: n/a (a) and (b) should be specified as periodic. You can decompose the symmtery into two symmteries and specify that as periodics as well. You will have to specify a mass flow rate or pressure gradient to sustian the flow in domain. - Usman

 April 10, 2008, 08:40 Re: What is Periodic condition?? #3 Vijay Guest   Posts: n/a Thanks Osman. But, once if I specify "inlet" & "outlet" as "region 1" & "region 2" periodic interfaces, I will not be able to apply any mass flow rate, pre grad or velocity etc. How can I apply these at inlet/outlet??

 April 10, 2008, 09:44 Re: What is Periodic condition?? #4 Usman Guest   Posts: n/a You will have to activate mass and momentum box on domain interface form and then specify pressure gradient or mass flow rate. Usman

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