AutoCAD DXF mesh-lines → STKO structured 3D hexa mesh for soil (annular/sector) + monopile SSI

[Omar Heshmat]

Hello STKO Team and community,

I’m a PhD researcher working on soil–structure interaction (monopile foundations). I want to model the soil as 3D brick/hexa elements and I want AutoCAD to represent the layout lines (radial + circular divisions of a cylindrical/annular sector), then import into STKO and generate a structured 3D hexa mesh (extruded in depth).
Goal: The hexa mesh lines in STKO should follow my imported radial/circular divisions and keep good mesh quality around the pile.

What I need (step-by-step):
1. Best way to import my AutoCAD layout (DXF/DWG?) and required DXF version/settings.
2. After import, the recommended STKO workflow to convert curves/lines → surfaces/volumes → structured hexa meshing, then extrude into layers (depth).
3. How to control edge divisions/seeds so the final hexa mesh matches the AutoCAD layout.
4. Best practice to keep the mesh compatible near the pile and at the soil–pile interface.
Attachments: I upload a two screenshots showing the intended layout + the target 3D sector mesh.

Thanks in advance for any guidance.

[STKO Team]

1. Best way to import my AutoCAD layout (DXF/DWG?) and required DXF version/settings.

Export it in a format that can be imported by STKO (IGES or STEP)

2. After import, the recommended STKO workflow to convert curves/lines → surfaces/volumes → structured hexa meshing, then extrude into layers (depth).

FaceFromPlanarCurves -> Extrude (or Sweep)

3. How to control edge divisions/seeds so the final hexa mesh matches the AutoCAD layout.

In the mesh tab you can find all tools to set global(or local) seeds