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April 19, 2012, 09:09 |
Rotational periodic boundary condition
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#1 |
New Member
Helen
Join Date: Apr 2012
Posts: 17
Rep Power: 14 |
Hello.
How do you think if I model the flow inside such two domains as: 1) the whole domain (360 degrees), containing, for example, 20 rotational periodic repeated parts 2) the domain (18 degrees), which is the sector 1/20 of the domain 1, using the rotational periodic boundary condition will the results identical??? I'll be thankful for yours comments PS. Sorry for my english |
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April 19, 2012, 09:44 |
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#2 | |
Senior Member
Lucky
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 5,674
Rep Power: 65 |
Quote:
The answer is not always. It will depend on the flow. It is definitely worth a shot to try it on the reduced domain though. Do you expect the flow in all 20 parts to be exactly the same? If yes, then yes you can model 1/20. If no, then do the full 20/20. An instability may arise in one or more of the parts and move through the domain, use of periodic boundary conditions would otherwise kill these structures. |
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April 19, 2012, 10:49 |
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#3 |
New Member
Helen
Join Date: Apr 2012
Posts: 17
Rep Power: 14 |
Thank you.
All 20 parts of the domain are the same, so I modeled 1/20 part using periodic boundary condition. But satisfying my interest I modeled whole domain (360 degrees) and I got the periodic flow field, but this flow field is differ from the 1/20. But I thought that results will be similar ... |
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April 19, 2012, 10:56 |
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#4 | |
Senior Member
Lucky
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 5,674
Rep Power: 65 |
Quote:
If you are doing steady RANS, they should be identical. |
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April 19, 2012, 11:47 |
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#5 |
New Member
Helen
Join Date: Apr 2012
Posts: 17
Rep Power: 14 |
I think the same way. But I don't know how to explain my results. (((
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