symmetry plane error due to a split-block

Nick R · August 2, 2011, 10:59

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

Nick R · August 2, 2011, 23:54

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.

PSYMN · August 3, 2011, 12:42

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

Nick R · August 3, 2011, 23:00

Thanks Simon. Is there a way to identify those nodes?

PSYMN · August 4, 2011, 18:56

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.

August 2, 2011, 10:59	symmetry plane error due to a split-block	#1
Nick R Senior Member Nick Join Date: Nov 2010 Posts: 126 Rep Power: 16	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

August 3, 2011, 12:42		#3
PSYMN Senior Member Simon Pereira Join Date: Mar 2009 Location: Ann Arbor, MI Posts: 2,663 Blog Entries: 1 Rep Power: 47	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 __________________ ----------------------------------------- Please help guide development at ANSYS by filling in these surveys Public ANSYS ICEM CFD Users Survey This second one is more general (Gambit, TGrid and ANSYS Meshing users welcome)... CFD Online Users Survey

August 4, 2011, 18:56		#5
PSYMN Senior Member Simon Pereira Join Date: Mar 2009 Location: Ann Arbor, MI Posts: 2,663 Blog Entries: 1 Rep Power: 47	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. __________________ ----------------------------------------- Please help guide development at ANSYS by filling in these surveys Public ANSYS ICEM CFD Users Survey This second one is more general (Gambit, TGrid and ANSYS Meshing users welcome)... CFD Online Users Survey

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August 2, 2011, 23:54		#2
Nick R Senior Member Nick Join Date: Nov 2010 Posts: 126 Rep Power: 16	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.

August 3, 2011, 23:00		#4
Nick R Senior Member Nick Join Date: Nov 2010 Posts: 126 Rep Power: 16	Thanks Simon. Is there a way to identify those nodes?