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-   -   Interfacing without a duct in CFX (http://www.cfd-online.com/Forums/cfx/108136-interfacing-without-duct-cfx.html)

k.vimalakanthan October 15, 2012 12:04

Interfacing without a duct in CFX
 
1 Attachment(s)
Hi,

I was wondering if anyone has successfully interfaced two different mesh regions, that are far apart from each other for their steady simulation in CFX.

I want the flow entering (A) to be exiting at (B) (please see the attachment). I could model this using a duct going from (A) to (B), but I do not want to do that.

http://www.cfd-online.com/Forums/att...1&d=1350316253

I have tried the following and failed :

General connection interface (no intersection permit checked):
1. None - gives out negative volume/element error
2. Frozen rotor interface - gives out negative volume/element error
3. Translational periodicity - asks for the faces (A and B) to be parallel, which are not.

Any help in this matter is greatly appreciated,
Thank you,
Kind regards,
Kishore

ghorrocks October 15, 2012 17:29

No, you cannot connect these regions with an interface.

I see two options:
1) connect the two regions with a meshed region. So you can control the flow resistance along it I would consider making it a porous region.
2) Define A as a pressure opening and B as a velocity boundary. Make the velocity at B a function of the pressure difference to get the right flow rate. Maybe make A a massflow inlet and then it is easier to get the mass conservation correct.


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