Touching edges fault won't heal on large structural face — need repair guidance

I’m running a CFD research project studying F1 aerodynamics — specifically how S-Duct front-chassis geometry affects front-axle downforce loss when a car follows another through turbulent wake. This requires 6 simulation runs (baseline + dirty-air conditions at varying following distances) using the Incompressible finite-volume solver in the SimScale Community tier. My geometry (“f1_2026_cfd_v2 parts”, Body137) was imported from Onshape as a STEP file.

Fix Interferences flagged several geometry faults on Body137. I’ve successfully resolved 4 “Self-intersecting face” faults and several “Face-face inconsistency” faults using Delete Face with the Heal option (or Leave Open for tiny sub-millimeter sliver faces).

However, 3 remaining “Touching edges” faults won’t resolve:

  • Edge 18040@Body137 and Edge 18096@Body137 (these are the same ones on the other two faults as well)

When I select the two faces sharing this edge and apply Delete Face → Heal, I get: “Healing failed. The selected healing method can not be applied to the model. Please select a different option.”

I can’t use “Leave Open” instead, because this specific fault sits on a large structural panel (appears to be sidepod/floor area, roughly 0.1–0.2m) — deleting it would create a real hole in the bodywork, not a harmless micro-gap like my earlier fixes.

This currently blocks Domain selection in my “Incompressible” simulation setup, with the message: “This geometry contains faults and cannot be used for simulation.”

Project link: https://www.simscale.com/workbench/?pid=6040812865739180532&geo=c639d7a4-2c92-4a3e-bea9-a3f9cab1ec67

Could you help repair this specific edge/face pair, or suggest an alternative fix that preserves the panel’s structure?

Thank you!

Hi,

For this type of geometry, due to its level of complexity, it’s usually a good idea to review it in a CAD software instead of doing it in SimScale directly.

The initial faults are typically going to be edge-to-edge contacts, self intersections in the geometry, complex/invalid topology… you can find some of these here: https://www.simscale.com/knowledge-base/why-do-geometry-operations-fail/

Are you interested in running exactly this CAD model? Or could it be a 2026 F1 model from someone else? You will find ‘valid’ CAD models in the public projects page (https://www.simscale.com/projects/), such as this one: https://www.simscale.com/workbench/?pid=5146588282183862424&geo=b487e9fe-a975-4dbc-928c-859b556ad91c