Smoothing the intersection boundary of two mesh - Questions

Is there a post-processing effect or method that can smooth the intersection line of two meshes? just like this:(smoothing the intersection area of head and neck)

Applied Sciences, Free Full-Text

Before (left) and after (right) refine a quadratic curved mesh edge M 1

Energies, Free Full-Text

Finding Mesh Overlap

Exported STL files from the segmentation has intersection/penetration - Support - 3D Slicer Community

Two-phase two-layer SNS-PFEM for hydromechanical geotechnical large deformation problems - ScienceDirect

Two surface meshes intersect along a polyline as shown. The orange

Multigrid method - Wikipedia

Experimental study of a turbulent boundary layer with a rough-to-smooth change in surface conditions at high Reynolds numbers, Journal of Fluid Mechanics