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Axial Compressor CFD-Help needed

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Old   April 29, 2008, 09:06
Default Axial Compressor CFD-Help needed
  #1
Pankaj
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Dear All,

I have no prior experience of periodic simulations. As Axial Compressors have more than 30 blades in a single rotor plus it requires Guide vanes,Stator means for a 360 deg case it will have more than 100 blades in a single stage.Thus mesh gets too huge.

So one must do periodic simulation.But with different No.of blades in stator,rotor & Guide Vanes can we analyse a single stage using Rotational Periodicty?(since for a frozon rotor interface areas doesnt match)

I am trying it,but solver gets overflow.I m stuck with the situation.Can anybody pull me out of this situation.

Thanks for your precious time.

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Old   April 29, 2008, 13:29
Default Re: Axial Compressor CFD-Help needed
  #2
Andrew
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How many blades are on each component and how do they align?

In order for there to be periodicity, the numbers of all the features around the axis must share a common factor. For instance, if you have 32 blades on your rotor and 7 guide vanes, your geometry won't be periodic regardless of the orientation of the rotor. If any component does not exhibit periodicity, then the geometry as a whole does not.

I understand the frustration as I am currently working with a simulation that would be 1/4 symmetric, except for one feature that exists in only 1 quadrant. As a result I can not use any symmetry on my geometry containing over 3,000 surfaces so my mesh contains over 20,000,000 cells.
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