Problem of Boundary condition
 

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 !

Does anybody have an idéa ???

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.