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symmetry plane error due to a split-block

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Old   August 2, 2011, 09:59
Default symmetry plane error due to a split-block
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Nick
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Hi all,


I intend to simulate flow over a 3d wing in a c-grid topology. I want to set the side planes (the parrallel ones) as symmetry but once I run cfx it terminates with the error that says one of my symmetry boundaries is not a strict plane.

So I think there might be some nodes that are not correctly positioned. But in ICEM everything looks right and I've checked every nook and cranny for a node that might not be on that plane.
I noticed that this error happens only when I apply a split block to create a boundary layer region (like the tutorial on youtube). As far as I know the associations look fine.
Is there a way to identify the nodes that are problamatic. I used check mesh but that looks fine too.
Any other suggestions are appreciated.

Nick
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Old   August 2, 2011, 22:54
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For anyone interested I solved the problem by using ICEM's move nodes command and specified the symmetry coordinates where I needed my mesh nodes to be then selected the two sides planes.
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Old   August 3, 2011, 11:42
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Good. I guess your geometry was a little off plane? ICEM CFD didn't mind, but your solver did. Your solution (just set the location for the symmetry nodes), is the easiest fix. Correcting the geometry would be another approach, but it is often more hassle and not really necessary.

Simon
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Old   August 3, 2011, 22:00
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Thanks Simon. Is there a way to identify those nodes?
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Old   August 4, 2011, 17:56
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We had a request for that a while back... Sort of like the periodicity check, but rather a symmetry plane check... But I never managed to get it in.
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