[AeroFan]

Hey guys!


until now I've read several threads regarding this topic and I have to confess no one could help me with that problem. My aim is to do an unstructured tetra-mesh in 2D around an airfoil with prism layers at the outer edge (the curves) of the airfoil. Now I've tried already to activate Blayer2D and select in the part mesh setup the curves, on top of which the prism layers should be and also the adjacent surface to it. In the end I enabled in the compute mesh options the prism layers and computed an tetra/mixed Octree mesh. The outcome sadly didn't have prism layers at all. Are there any other things to pay attention to when using the option Blayer2D or did I do anything wrong on the way to compute those prism layers? Or is there even another possibility to get this problem fixed?
Thanks in advance!

[Stel]

It seems that this is the same problem you have posted in another thread. Well, I'm having a hard time trying to understand your problem. Could you attach some figures (geometry of interest, print screen of the failed mesh, etc)?

[Stel]

Well, I was trying something here and it worked for me. Maybe you could try it, not the ideal solution but maybe it serves you any purpose. It would be to mesh a 3D geometry first (where the prisms work without problems) and next extracting a 2D mesh from it.

1 - Create a 3D version of your geometry by extruding a given (and uniform) "z" width of it.
2 - Create all the parts as usual, including the curves from one of the 2D faces (just as you would do for a 2D mesh). In particular, there will be the curves around the airfoil on the original 2D face, and the surface of the airfoil (a surface part) which is the result of a sweep of the curves. Let's name this last surface as AIRFOIL_SURF
3 - Mesh your geometry as a 3D mesh. Create prism layers afterwards around the AIRFOIL_SURF part.
4 - After the mesh is finished, check the boxes in the Mesh tree branch to reveal all shells and volumes. Next, in the Part tree branch, make it show everything except the curves and the surface of the original 2D face where you actually want the mesh.
5 - In Edit Mesh, select delete elements, click and drag with the left button to select everything that is on screen, and confirm with the middle button.
6 - Reveal the mesh again by checking the corresponding boxes in the Part tree branch. Check if the surface mesh remained on the parts as intended.
7 - Save the mesh as a 2D mesh.

This worked for me here. Let us now if that works for you too. Good luck!

[siw]

It might seem crazy but the ICEM prism mesher (not the volume or surface element mesher) has given me crazy problems (2D and 3D) and one fix was due to the pathname/filename that the ICEM project was saving to - that was ANSYS technical support telling me that. Perhaps check that you are using a short and simple pathname and filename.

Some points to add for making a 2D boundary layer with an unstructured triangular 2D domain:

- Run Build Topology before generating the mesh.
- Put the aerofoil curves into a Part.
- Put the 2D flowfield surface into a Part.
- Assign prism parameters either globally in Global Mesh Setup or locally in Part Mesh Setup. I do this globally.
- Select Blayer 2d = ON in Advanced Prism Meshing Parameters
- Select Prism = ON in Part Mesh Setup for both the aerofoil curves and the flowfield surface.
- This will put all the elements and surface in the same Part. After the mesh has been generated create a new Part and put the surface in it. So that the elements are in their own Part.
- Select Apply inflation parameters to curves = ON in Part Mesh Setup.
- Generate the surface mesh (red icon) and not the volume mesh (blue icon). After that generate the prism mesh (orange icon)

Making unstructured 2D meshes with boundary layer in ICEM is always a problematic. ICEM is winding down, maybe try an ICEM Hexa mesh or the ICEM replacement SpaceClaim Interactive Meshing. Also ANSYS Meshing is OK for this also. Image is a quick test using a circle rather than an aerofoil.