[Loris88]

Hello everyone!
I have done mesh with ICEM, then I have imported it in Ansys CFX 14.0.
After setting all things in CFX-Pre, I start the simulation, but there is a problem:

|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 3 in the |
| symmetry boundary patch |
| |
| PARETE_SYM_2 |
| |
| 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. |

This is the error message that I received.
After reading some past messages about this error, I have found this reply
"In pre-mesh, in ICEM, click on "No Projection"". I tried this and the first time that I have done that, the problem is solved... but, now this solution does not work anymore.. Can you help me?
I do not have particular geometry... one rectangular channel with a block at circa half length channel... in CFX, I have to analyze this problem in 2D...

I read many post online... I also tried to apply the suggestions that Ansys gives me but in every cases, I do not succeed to solve the problem. I have found also post that it said "Click in ICEM tab Global Mesh Setup and then go to Edge Criterion...change value from 0.2 to 0.05" but nothing...