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ABAQUS/CFD multiple parts

ABAQUS/CFD multiple parts

ABAQUS/CFD multiple parts

(OP)
I am working with the ABAQUS/CFD package. I have a slightly more complex assembly, basically a pipe (long cylinder) flowing into a chamber (rectangular box), which is subsequently connected to several other outlet pipes (more cylinders).

I have the parts listed in ABAQUS, and then combined them in Assembly. Do I have to do anything special to "tie" the faces of these inlet/outlet surfaces? Or is the only option to model the whole assembly as a single part and then define the appropriate sections with the relevant BCs?

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