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Old   April 6, 2015, 16:52
Default mismatched contours CFD-Post
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Hi all,

I hope you are well.

I have a small question regarding contour plotting in CFD-Post.

I am modelling a portion of the turbine (x1 blade passage), but i want to represent x2 passages in my post-processing for various reasons.

If i select x2 data instances for my model, and plot my contours, the contour lines do not match up well at the periphery of the plane on which i am plotting the contours. (see figure).

I am not sure why this is the case, the simulation is well converged and and the mesh is very regular in that region.

I am using Fluent to solve, and as its a turbine passage, the outside of each passage (i.e. RHS / LHS of the contour plane) are modelled using cyclic / periodic BC's.

Has anyone encountered this issue before?

Many thanks and regards
Jonathan
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File Type: jpg Cp0rel_outletplanar_X4.jpg (35.0 KB, 10 views)
File Type: jpg Ptotrelabs_outletplanar_X3.jpg (45.3 KB, 8 views)
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Old   April 6, 2015, 20:26
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This is an issue with the way contour lines are rendered in CFD-Post. So it is a post-processing problem, not a solver problem.
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Old   April 6, 2015, 20:41
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Hi,

thanks very much for your answer ...

Do you know whether there was ever a fix or workaround developed for it?

When you say its a post-processing problem, do you mean it is one which cannot be mitigated when plotting cyclic boundary type problems (do you just live with it???)

many thanks,
regards
jonathan
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Old   April 6, 2015, 20:47
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You can report it to ANSYS as a bug if you like.

I know of no way to work-around it. I just live with it. When you have a mesh fine enough to do an accurate simulation the mismatch is very small and hardly visible.
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Old   April 6, 2015, 20:52
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Thanks a lot for the info mate, appreciate that. I was concerned it was something i was doing. good to know i am not the only one.

Might pass something on upstream to our local vendor - can't really hurt i guess!

thanks again very much
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