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CCM + handles sliding vanes?

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Old   May 22, 2007, 19:09
Default CCM + handles sliding vanes?
  #1
Vmax
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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
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Old   May 23, 2007, 03:39
Default Re: CCM + handles sliding vanes?
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Balduin Bankerotti
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It is only possible with star V3.

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

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Old   May 23, 2007, 05:44
Default Re: CCM + handles sliding vanes?
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Dave
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If it's a rigid body motion using an arbitrary sliding interface (ASI), then yes starccm+ can handle it.
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Old   May 23, 2007, 06:58
Default Re: CCM + handles sliding vanes?
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Vmax
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Thank you.

Vmax
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Old   May 23, 2007, 18:08
Default Re: CCM + handles sliding vanes?
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Balduin Bankerotti
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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.
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Old   May 24, 2007, 04:25
Default Re: CCM + handles sliding vanes?
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Vmax
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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

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Old   May 24, 2007, 05:07
Default Re: CCM + handles sliding vanes?
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Joern Beilke
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"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.

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Old   May 24, 2007, 05:52
Default Re: CCM + handles sliding vanes?
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Vmax
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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
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Old   May 24, 2007, 08:25
Default Re: CCM + handles sliding vanes?
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Joern Beilke
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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.

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Old   May 24, 2007, 13:11
Default Re: CCM + handles sliding vanes?
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Ahmed
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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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