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-   -   Reversing Fan Direction / Cyclic Boundary Conditions (http://www.cfd-online.com/Forums/openfoam-solving/80688-reversing-fan-direction-cyclic-boundary-conditions.html)

dk1 October 4, 2010 04:49

Reversing Fan Direction / Cyclic Boundary Conditions
 
Hello

I'm using a cyclic boundary condition with a fan boundary condition by supplying the pressure rise curve but unfortunately the fan flow is in the wrong direction. How can I reverse the fan direction ?

Thanks in advance

maddalena October 4, 2010 05:17

Hi David,
Quote:

Originally Posted by dk1 (Post 277627)
How can I reverse the fan direction?

I had the same problem some time ago. I did some tests and report results here. Please, read everything till the end, hope you can find some good hints there.
Enjoy.

mad

dk1 October 4, 2010 05:26

Hi Mad

Thanks, I've seen that post but it refers to a model created using blockMesh. My mesh has been converted from a Fluent/Gambit file so I can't control the cyclic face master/slave in this way. I've tried a direct mesh conversion using fluent3DMeshToFoam with the cyclic defined as a fan and also converting a patch-a/patch-b pair and creating the cyclic using createPatch utility but no success. On a different model I got the right direction without any change so I think I am looking for a way to reverse the master/slave order.

maddalena October 4, 2010 05:37

Hi,
Quote:

Originally Posted by dk1 (Post 277632)
On a different model I got the right direction without any change so I think I am looking for a way to reverse the master/slave order.

I faced the same difficulties, since I am not using blockMesh as well. With the software I am using, the patch order (master-slave) is set by the surface domain number, which is a consequence on the domain creation. For example let us say I have the following surfaces:
domain-1
domain-2
domain-3
domain-6
domain-7
and I want to make domain-6 cyclic. First I copy paste domain-6. A new domain is created: domain-4 (the first empty name on my domain list). As a consequence, domain-4 will be the master and domain-6 the slave. This works for my software (pointwise). Check if it is ok for Gambit as well.
cheers

mad.


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