I am performing a computation of flow through a downward facing step with periodic lateral boundaries. I use a mesh composed of both structured cells in some regions and unstructured mesh elsewhere. I need to use the joining face option in order to include the non-structured area in the domain (otherwise it is considered as a wall). I have to avoid non-conformal mesh because of some user functions.
The mesh is conformal but cells at the front periodic boundary are different from those at the rear wall. I think that this is the reason for the following message in the listing file (see attached file listing.txt):
Am I right? What are the solutions to keep mesh conformal while performing computation with periodic boundary conditions?Periodicity type: translation
...
Global number of intersections detected: 1068880
Vertex-Vertex intersections: 995952
Other intersections: 72928
Joining operation is non-conforming.
I selected all the surfaces of the non-strucutured area for the joining face and I declared the entire front and rear surfaces as periodic conditions (including the surfaces of the non structured areas). Is that the good way of doing it?
The setup file and an insight of the used mesh are attached (note that to simplify the reading, the cell size in the non structured area has been increased, the cells of the front and rear periodic conditions are very close when I use more refined mesh, but they are not exactly the same...).
Thanks a lot for your help!