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 pyroknife May 20, 2013 23:42

FLUENT Problem

I did a mesh check in FLUENT and received the error "symmetry zone 54 has two adjacent cell zones." What does two adjacent cell zones mean? I tried searching for this error to no luck.

 oj.bulmer May 21, 2013 05:35

I think you have fluid zone (or domains) at both the sides of symmetry, making symmetry as an internal face, or interface between two domains, which is not allowed. Try correcting your model by deleting the fluid zone at one side of symmetry or specify the symmetry such that it doesn't have any zone at the other side.

OJ

 pyroknife May 21, 2013 15:34

Quote:
 Originally Posted by oj.bulmer (Post 428842) I think you have fluid zone (or domains) at both the sides of symmetry, making symmetry as an internal face, or interface between two domains, which is not allowed. Try correcting your model by deleting the fluid zone at one side of symmetry or specify the symmetry such that it doesn't have any zone at the other side. OJ
Thanks for the reply. There is a fluid zone on both sides of the symmetry plane though. I have a complicated geometry that is essentially a pipe. I applied symmetry through the midplane of the pipe so there should be fluid on both sides of the symmetry, no?

 oj.bulmer May 21, 2013 15:40

Why do you need the fluid domain at both the sides of symmetry? symmetry is used so that you don't have to use a full geometry but only half one, because the flow structure in the other half is exactly mirror image of the one you are simulating! Remove the domain at one side of the symmetry, otherwise you won't be able to simulate.

OJ

 pyroknife May 21, 2013 15:46

Quote:
 Originally Posted by oj.bulmer (Post 428980) Why do you need the fluid domain at both the sides of symmetry? symmetry is used so that you don't have to use a full geometry but only half one, because the flow structure in the other half is exactly mirror image of the one you are simulating! Remove the domain at one side of the symmetry, otherwise you won't be able to simulate. OJ
I haven't had much experience with FLUENT/ANSYS. What do you mean by removing the domain at one side of the symmetry?
If we're thinking of the same thing, then I may have already removed it in design modeler with the symmetry feature. I attached an image of what I mean.
Red is my symmetry surface.

Not sure if this matters, but i tried simulating yesterday without solving that error and the solutions started diverging at about 30 iterations. Would this kind of error affect convergence?

Thanks!

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