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-   -   CCM + handles sliding vanes? (http://www.cfd-online.com/Forums/cd-adapco/56081-ccm-handles-sliding-vanes.html)

Vmax May 22, 2007 19:09

CCM + handles sliding vanes?
 
I'm currently facing a job in the sliding vane compressor industry. It could be it will be required some cfd on this and I'm wandering if ccm+ can hanlde such problems and if people who already had any experience in the sector could give me some advice.

Thanks, Vmax

Balduin Bankerotti May 23, 2007 03:39

Re: CCM + handles sliding vanes?
 
It is only possible with star V3.

http://www.beilke-cfd.de/rotary.mpg


Dave May 23, 2007 05:44

Re: CCM + handles sliding vanes?
 
If it's a rigid body motion using an arbitrary sliding interface (ASI), then yes starccm+ can handle it.

Vmax May 23, 2007 06:58

Re: CCM + handles sliding vanes?
 
Thank you.

Vmax

Balduin Bankerotti May 23, 2007 18:08

Re: CCM + handles sliding vanes?
 
It is more than rigid body motion and ccm+ is not able to do it.

The vanes are sliding into the rotor, so this requires some radial filling of vertices.

Vmax May 24, 2007 04:25

Re: CCM + handles sliding vanes?
 
In this particular application it isn't actually of interest to simulate the vanes radial motion, what suffices is to be able to simulate the rotor with fixed-length paddles rotating eccentrically inside the stator, which brings me to the question: if I go this way, is it possible to do this in ccm, despite obvious interference between the rotating paddles and the stator casing?

Thank you for your answers. Vmax


Joern Beilke May 24, 2007 05:07

Re: CCM + handles sliding vanes?
 
"Normal" sliding mesh is no problem with ccm+.

Where is your problem to simulate the sliding vane pump with star v3. It is not that difficult. I can sell you the mesh motion macro if you want it. It is parametric, so you can create nearly every rotor with yust changing some numbers.


Vmax May 24, 2007 05:52

Re: CCM + handles sliding vanes?
 
Ok, as far as I understand the problem Bankerotti pointed out was about a sliding mesh moving onto a rotating reference frame, and this is not possible with ccm, do you agree with him?

About the software: the company interested in this application already got a star ccm + license and will not go for a starCD one in this year, neither will I.

About your work: I just took a look into your website and it looks very interesting. Basically I do quite the same job here in Italy, as a cfd consultant. Now I'm going to migrate from CFX to starCCM+, both for usability and for costs reasons, that's why I'm so interested in it. If you are interested in sharing some opinions I can write to your website address, but only if you are interested, I don't want to spam you with unwanted messages.

Thanks, Vmax

Joern Beilke May 24, 2007 08:25

Re: CCM + handles sliding vanes?
 
A sliding vane pump is not a turbomachine, so you can not use rotating frames of reference. You have to model the geometry change of the chambers and this is not possible with ccm+ because it is not pure sliding mesh.


Ahmed May 24, 2007 13:11

Re: CCM + handles sliding vanes?
 
Joern Beilke states "A sliding vane pump is not a turbomachine" that is absolutely right. Though the rotor has a certain rpm but the physics of the problem is that of a compression process, i.e. a changing volume, with one boundary moving at the corresponding speed (Omega X rotor radius). Excellent movie


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