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How to model sudden expansion

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Old   May 18, 2010, 11:32
Default How to model sudden expansion
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Hi all,

I am busy modelling air flow through a huge pipe. Actually the pipe is just the last part of a pretty simple model.

Dia = 1m
Length = 100m
Velocity at inlet = 10m/s

The outlet of the pipe is at atmosheric pressure. Is there a special boundary in OpenFOAM that can take into account the sudden expansion at the outlet (like a head loss or vent or..) or do I actually have to model a bit of atmoshpere to take this into account? See the attached image.

Many thanks,

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