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Annular flow in pipes

Annular flow in pipes

Annular flow in pipes

(OP)
As a new user of CFD I'm trying to model the flow of water down a pipe that is inserted into a larger pipe, blocked off at one end, so that the outflow is through the annular region that is formed by the internal and external pipe. When I look at the results from the axisymmetric model in the outflow region I find that the flow is predominantly to the outer radial surface but the flow adjacent to the inner pipe (in the outflow region) runs counter to that flow like so:
_______________________________________________
<<<--- <<<---- <<<----                        !
<<---  <<---  <<---                <        \ !
/ <---                 Outlet         \       !
---> ---> --->                                !
--->> --->> --->>                  > /        !
__________________________________            !
________Inner Pipe _______________!           !
     --->>>> --->>>> --->>>         /      /  !
Inlet--->>>> --->>>> --->>>         /     /   !
-.-.-.-.-.-..-.-.-.-.-.-.-.-.-.-.-.-.-..-.-.-.! Symmetry

This seems illogical to me as the outlet region is specified as such and not as an open boundary. Is there an obvious error?

corus

RE: Annular flow in pipes

It would seem like the left hand side of the outer pipe has an improper boundary condition.

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