# Periodic Boundary

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 January 14, 2008, 17:47 Periodic Boundary #1 Mann Guest   Posts: n/a Hi I am simulating a flow in a square duct with four cubes inside it. I want to set up a periodic boundary condition for my flow. In order to do that i first created a domain interface for inlet and outlet and set a translational peridocity as interface model. I have following questions: 1) Do i have to specify change in pressure? If yes how can i calculate it. 2) I would like to specify constant pressure gradient of -1.59 Pa m^-1. How can i do that! Thanks for your help!!

 January 15, 2008, 17:51 Re: Periodic Boundary #2 Glenn Horrocks Guest   Posts: n/a Hi, 1) You need to specify something to get the flow moving! 2) From your other posts it looks like translational periodicity with a pressure difference might be appropriate. If your duct is 1 metre long then my guess is the pressure drop would be 1.59 Pa. I will let you guess what the pressure drop is for other lengths. Glenn Horrocks

 January 15, 2008, 20:24 Re: Periodic Boundary #3 Mann Guest   Posts: n/a Can i not specify constant pressure within every cell of my domain to get the flow moving. Thats what they seem to have done in the paper. But my problem is i dont quite know how to do it! If anyone out there can give any input it will be very helpful. I am using LES smagorinsky model!. Mann

 January 16, 2008, 05:54 Re: Periodic Boundary #4 Glenn Horrocks Guest   Posts: n/a Hi, As previously stated setting a constant pressure gradient per cell cannot be done. This is especially so if you are doing a LES simulation! You need the pressure field to couple with the velocity field to get something of physical meaning. Glenn Horrocks

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