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-   -   [ANSYS Meshing] Periodic issues in cutcell meshing (http://www.cfd-online.com/Forums/ansys-meshing/96345-periodic-issues-cutcell-meshing.html)

jsm January 20, 2012 04:05

Periodic issues in cutcell meshing
 
Dear All,

I tried to mesh the model that has rotational periodicity using cutcell method. But mesh in periodic faces are not similar. Is it possible to use cutcell meshing for periodic models?

jsm January 31, 2012 07:42

At last I found that periodic meshing is not possible with cutcell meshing.

Is there is any chance it will be available in next release?

This is much useful meshing method but I could not use it in my models because of this limitation.

Far March 6, 2012 12:03

But you can create the GGI periodic in Fluent . No need to set it in ICEM

jsm March 7, 2012 22:56

Hi Far,

Thanks for your information. I also thinking of using this option in Fluent. But due to GGI interface also, there will be some accuracy loss.

What do you think about this? Did you used this option before and validated for accuracy and result variation?

By the way, I am trying to use Ansys meshing (AMP) for meshing not ICEM CFD.

Far March 7, 2012 23:22

Quote:

Thanks for your information. I also thinking of using this option in Fluent. But due to GGI interface also, there will be some accuracy loss.

What do you think about this? Did you used this option before and validated for accuracy and result variation?

By the way, I am trying to use Ansys meshing (AMP) for meshing not ICEM CFD.
CFX has been offering this option for long time and it is very much successful specially in rotating machinery.

Loss of accuracy is not noticeable as compared to other losses such as turbulence model, flow scheme, convergence error and interface error (e.g. mixing plane in rotor-stater interaction). I tried in CFX as well in Fluent and I am fully satisfied with results.

Yes, you are correct as this option is only available in AM not in ICEM.

jsm March 8, 2012 10:53

Hi Far,

I am using only Fluent for simulations. I never used interface in periodic boundary condition as I thought this will reduce the accuracy of results.

I think that I should try once with GGI interface in Fluent. And let's hope periodicity option for cut-cell meshing will be available in next release (Ansys 14.5).

Once again thanks for your comments and response:).

Far March 8, 2012 11:51

Quote:

Originally Posted by jsm
I am using only Fluent for simulations. I never used interface in periodic boundary condition as I thought this will reduce the accuracy of results.

According to my observation (it is fact also) , after acquisition of Fluent (later) and CFX (earlier) by ANSYS, ANSYS is making both codes stronger by combining their strong points and replacing their weak points.

Quote:

Originally Posted by Far
CFX has been offering this option for long time and it is very much successful specially in rotating machinery.

When I referred to CFX's GGI, actually I was trying to highlight that Fluent is now also equipped with same technology.

jsm March 8, 2012 22:00

Hi Far,

Ok. I got your points.

I will perform one simulation with GGI interface and let you know if I face any issues.

Thank you


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