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July 27, 2012, 02:24 |
Fundamental Question about Rotating wall!
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#1 |
Member
Khayyamian
Join Date: Dec 2010
Posts: 46
Rep Power: 16 |
Dear all;
suppose we want to model a 3-bladed fan in a duct. I konw that we have to use either: -SRF (MRF when duct is not surface of revolution) -Sliding mesh -Moving mesh My simple(!) question is: why we cant just use moving wall boundary condition for the fan blades? i.e. no need to define rotating frame or .... I think if the the rotating wall was axissymmetric like a cylinder or a disk, then it would be reasonable. Am I right? Thanks in advance for your reply! |
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July 27, 2012, 03:58 |
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#2 |
Super Moderator
Alex
Join Date: Jun 2012
Location: Germany
Posts: 3,427
Rep Power: 49 |
You are right. Simply applying a rotating wall boundary condition only works if the wall is a surface of revolution (of course with the same axis of rotation).
This is not applicable if the wall is not a surface of revolution because in this case, the wall would acually move through the fluid domain. This is not possible. An immersed boundary would be another option for a rotating body. |
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moving wall, mrf, srf |
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