And in NX 2212 feeding STAR-CCM+ 2402, a 0.5 mm fillet tweak on an underbody diffuser keeps breaking G2 curvature and spawning sliver faces, stretching the loop from about 9 to 24 minutes per variant. What surfacing or heal settings (tolerances, face-merge, mesh prep) are you using to keep a watertight A-surface and stable aero iterations without dulling the curvature?