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How represent/ mesh ambient region outside a geometry in OpenFOAM

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Old   February 9, 2017, 10:16
Default How represent/ mesh ambient region outside a geometry in OpenFOAM
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I am relatively new to OpenFOAM and I have been running a few simple simulations. I am currently modelling flow through a box (see attached screen shot) with inlet and outlet boundary conditions and getting some sensible results. I however wish to extend my computational domain to see how the flow interacts with the ambient as it emerges from the outlet boundary of the geometry.

Any suggestion/ideas on how to represent/mesh ambient region around a geometry in OpenFOAM is much appreciated.

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ambient meshing

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