[pizzaspinate]

Hi,
I have used the ANSYS meshing tool in order to mesh a blended wing. I am able to get inflation layers around it. However if I try to solve it I get the following error:

ERROR #002100013 has occurred in subroutine Chk_Splane. |
| Message: |
| The symmetry boundary condition requires that the boundary patch |
| mesh faces form a plane or axis. However, face set 2 in the |
| symmetry boundary patch |
| |
| Symmetry |
| |
| is not in a strict plane, which means that at least one of its |
| faces is not parallel to the others. To make the solver run |
| you can do one of the following: |
| |
| (1) Make sure that this symmetry boundary patch is in a plane or |
| axis by checking and regenerating the mesh. |
| (2) If the symmetry boundary patch is an axis rather than a |
| plane, change the tolerance of the degeneracy check by |
| increasing the value of the Solver Expert Parameter |
| 'degeneracy check tolerance' (the default value is 1.e-4). |
| (3) Increase the value of the Solver Expert Parameter |
| 'vector parallel tolerance' (the default value is 1 deg.). |
| Note that the accuracy of the symmetry condition may decrease |
| as the tolerance is increased. This is because the tolerance |
| is the number of degrees that a mesh face normal is allowed |
| to deviate from the average normal for the entire face set.




I would prefer not to touch the expert parameters as I have heard they have quite an influence on the accuracy of the solution and was wondering if there is a way to fix this problem.

I read that the issue might be due to the inflation layers, however, i encounter the same problem when meshing it without inflation layers.

It is working fine if I use instead of the BC Symmetry the condition "free slip wall" or "opening". But im not sure if that negatively effects my results.

Also tried to mesh in ICEM without success so far.

Would be great if someone could help me out

Thanks

[ghorrocks]

It means there is an error in your mesh. One or more elements are not in the plane of all the other elements. Fire up your meshing package and try to find what that is. It could be a named selection which has two non-planar surfaces in it, or in ICEM it could be even a single element off the surface.

[Antanas]

Originally Posted by pizzaspinate

Hi,
I have used the ANSYS meshing tool in order to mesh a blended wing. I am able to get inflation layers around it. However if I try to solve it I get the following error:

ERROR #002100013 has occurred in subroutine Chk_Splane. |
| Message: |
| The symmetry boundary condition requires that the boundary patch |
| mesh faces form a plane or axis. However, face set 2 in the |
| symmetry boundary patch |
| |
| Symmetry |
| |
| is not in a strict plane, which means that at least one of its |
| faces is not parallel to the others. To make the solver run |
| you can do one of the following: |
| |
| (1) Make sure that this symmetry boundary patch is in a plane or |
| axis by checking and regenerating the mesh. |
| (2) If the symmetry boundary patch is an axis rather than a |
| plane, change the tolerance of the degeneracy check by |
| increasing the value of the Solver Expert Parameter |
| 'degeneracy check tolerance' (the default value is 1.e-4). |
| (3) Increase the value of the Solver Expert Parameter |
| 'vector parallel tolerance' (the default value is 1 deg.). |
| Note that the accuracy of the symmetry condition may decrease |
| as the tolerance is increased. This is because the tolerance |
| is the number of degrees that a mesh face normal is allowed |
| to deviate from the average normal for the entire face set.




I would prefer not to touch the expert parameters as I have heard they have quite an influence on the accuracy of the solution and was wondering if there is a way to fix this problem.

I read that the issue might be due to the inflation layers, however, i encounter the same problem when meshing it without inflation layers.

It is working fine if I use instead of the BC Symmetry the condition "free slip wall" or "opening". But im not sure if that negatively effects my results.

Also tried to mesh in ICEM without success so far.

Would be great if someone could help me out

Thanks

I remember once I encountered such error when I place two surfaces into one symmetry BC. But when I create separate symmetry BC for each, error disappeared. I think it was due to CFX for some reason treated this surfaces as one surface.

[pizzaspinate]

thanks for the quick reply

the aerofoil on the symmetry plane looks like in the attached pictures...Im not sure whether it is the graphics or whether the inflation layer around the leading and trailing edge has distorted elements which make the plane non-planar....

[ghorrocks]

It is hard to see what your images are showing. Why is there mesh in the airfoil?

But yes, it does appear as if your inflation layers are not planar and if that is your symmetry plane then that looks like the source of your error.

[pizzaspinate]

It just looks like there is a mesh inside the aerofoil.

So if the inflation layers are the issue how can I fix this. Would slicing the geometry help? Or do I have to touch any of the advanced inflation layer options?

[ghorrocks]

If this is in ICEM then you can just edit the mesh by projecting the nodes onto the surface it is meant to be on. If this is in Workbench it is trickier as it seems to have a mind of its own sometimes.