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Old   September 4, 2008, 05:07
Default sliding interface problem
  #1
cesco
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following the fluent on line guide, I tried to simulate a profile rotating around a shaft, with moving mesh. The simulation is 2D. I created an internal circolar domain, with the pofile inside,that rotate around the origin, and an exernal circolar crown that is fixed. I merged the two meshes defining the interface. I have two problems. 1) nothing seems to pass through the interface 2) the lift coefficient results are about 1000000. How is it possible that nothing passes through the interface? Is this linked to the CL error?
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Old   September 4, 2008, 05:36
Default Re: sliding interface problem
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mAx
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have you defined the interfaces in fluent? what do yaou mean with "merged"? your edges, which define the interfaces, should be NOT connected each other
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Old   September 4, 2008, 06:59
Default Re: sliding interface problem
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cesco
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hi Max, thank you for you participation. with "merged" I mean that I created the two files *.msh and than I merged them with the t-merge utility of fluent, as explained in the guide. In this way there are two edges superimposed that are my interface. I set them as interfaces and than I created the grid interface in fluent. I'm working with a 360 circle so I set the interface as coupled instead of periodic. Once the iteration is completed I displaied the velocity contour and the stator zone appears not interested in the action of the flow. Why?
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Old   September 4, 2008, 07:29
Default Re: sliding interface problem
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mAx
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*is your computation converged? *do you see any discontinuity on both sides from the edges (typically pressure) *have you check your mesh (grid/check) If you still have doubt, I can take a look at your model (you can email me your model)
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Old   September 4, 2008, 09:08
Default Re: sliding interface problem
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cesco
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well i recived the suggestion to not select any option in the grid creation box, not periodic, not coupled. now I have already launched the iteration. If you would like to be so kind to analyse my case and data to find some errors (there are many for sure because I obtain cl and cd too big) I will appreciate. Tomorow I will send them to you. many thanks.
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Old   September 5, 2008, 03:10
Default Re: sliding interface problem
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joao
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Hi,

Did you initialize the flow manually? I had the same problem yesterday and after initialization, it was ok.

Regards

Joao
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Old   September 5, 2008, 03:22
Default Re: sliding interface problem
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cesco
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yes I initialized it manually. now the simulation I launched yesterday is still running so I still do not know if the prblem is solved but already now I can see from the plot Cl and Cd that the results are very far from periodic. Another problem I realized to have is that the simulation does not run if I let the fluid rotate without an asintotic velocity. I mean: if I set an inlet veocity 0, the iterations do not start...????????????? why??
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Old   September 5, 2008, 08:42
Default Re: sliding interface problem
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joao
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Hi,

When you first loaded the case file, was there any error message?

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Old   September 5, 2008, 10:37
Default Re: sliding interface problem
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cesco
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no, no error messeges. all seems to be good but the inner domain does nt rotate inside the other without seeting an asintoti velocity.
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Old   September 5, 2008, 10:38
Default Re: sliding interface problem
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cesco
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no, no error messeges. all seems to be good but the inner domain does nt rotate inside the other without seeting an asintoti velocity.

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