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Boundary Conditions / Constraints ?

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Message 1 of 4
timsefton
512 Views, 3 Replies

Boundary Conditions / Constraints ?

Okay, I'm somewhat confused on the boundry conditions requirements for even the simplest of fluid flow analysis,

 

Lets say I've got the following model -  One input of compressed air and two open ends of the pipe its going into.  Like this.

 

diang.png

 

So from what I can make out i'd do the following constraints:

 

1)  Inlet / Outlet at the Open Start end of the pipe and exclude surface from boundry conditions.

2)  Inlet / Outlet at the Open End of the pipe and exclude  surface from boundry conditions.

3)  Inlet / Outlet at the Air Input along with a perscribed flow of 129 in/sec in the correct direction (external fan just doesn't seem to work well at all)  and  exlude surface from boundry conditions 

 

Would that be a fair way to frame the constraints (and lets just say that is a steady state condition with a low reynolds number for simplicity)?

 

Your thoughts ?

 

Tim

3 REPLIES 3
Message 2 of 4
John_Holtz
in reply to: timsefton

Hi Tim,

 

You description is very close. I think you meant "exclude surface from boundary layer mesh" instead of "exclude surface from boundary conditions". Also, only the prescribed velocity (flow) is required in step 3; the inlet/outlet load is not needed.

 



John Holtz, P.E.

Global Product Support
Autodesk, Inc.


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Message 3 of 4
timsefton
in reply to: John_Holtz

Hi John,

 

Yes, I did mean the exclude surface from boundry layer mesh (does this matter if its is checked prior to meshing or after meshing ?)

 

Thanks for you help !

 

Tim

Message 4 of 4
Joey.X
in reply to: timsefton

Excluding surface from boundry layer mesh has to be applied before surface meshing (i.e, click meshing button). 

Jianhui Xie, Ph.D
Principal Engineer
MFG-Digital Simulation

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