# Problem of Boundary condition

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 December 18, 2009, 20:31 Problem of Boundary condition #1 New Member   matth Join Date: Aug 2009 Posts: 8 Rep Power: 10 I would like to see the flow in a unsteady cylinder. The flux is unsteady and I wrote an UDF to the velocity inlet. The velocity varies from 0m.S to 10m.s. What condition have I to put at the end of the cilinder. If I put pressure outlet, I find that the velocity is the same in all the cylinder and it seems strange, isn't it ? Otherwise, can you explain why the velocity is the same at the begining of the cylinder and at the end ? Thank you !

 December 22, 2009, 20:54 #2 New Member   matth Join Date: Aug 2009 Posts: 8 Rep Power: 10 Does anybody have an idéa ???

 December 22, 2009, 21:12 #3 Senior Member     YH Tan Join Date: Mar 2009 Location: Malaysia Posts: 119 Rep Power: 10 How u setup ur BC for various velocity according to time? I think ur fluid is imcompressible, so there is no velocity difference in cylinder. Try change the fluid become Ideal gas. __________________ Herntan, Add Reputation if I am right

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