code_saturne User's Forum

Hello,

With the method ALE , I got a run a calculation for a flow between two cylinder (annular cavity) on a fine grid, and for a time step of the order 10^-6, to avoid negative volumes, otherwise the calculation stops. For the same geometry, I would test a coarse mesh. For this I made ​​a coarse mesh (attached) and I made the calculation. The problem is that this calculation does not start because it can not find my boundary conditions that I imposed in the .Xml. I tried several meshes, and still I have the same error message in the listing file attached.

I'm sure this problem comes from the grid, but I can not resolve the dispute.

Thank you very much.

Nazir

Hello,
Running the preprocessor (or checking your listpre file), you may see that you have 2700 boundary faces with no group. They might be handled by your geometric selection criteria for your first symmetry condition, but if they are not, it would explain your problem.
Best regards,
  Yvan

Hello, Even if I change the types of boundary conditions , symmetry in the wall, there is always the same error message. In addition, all the faces on the bord of its geometry is in one of these four groups. I do not know why SATURN find only certain faces.

Best regards

Nazir

Hello,
I just loaded your mesh file under SALOME 6.4.0, and I confirm that the top boundary faces are part of no group (the bottom faces are part of "paroi_basse", but there is no equivalent for the top faces.
So the problem is already visible under SALOME, and is purely a mesh faces groups definition issue.
note that with version 2.0 of Code_Saturne (vs versin 1.3), you may get an error.ensight (or error.med or error.cgns) postprocessing output, showing you which faces have an incorrect or missing boundary condition in cases such as this one.
Best regards,
  Yvan