[Eloise]

Hello!
Here I come with a nice challenge, I hope some of you will be interested in it and contribute with their ideas
For some reasons, I have a spherical mesh which I need to cut along a plane. Since I don't know the plane position before meshing the sphere, I have to cut the already meshed sphere. I found two ways of cutting my existing mesh:
1) call snappyHexMesh on the existing mesh, define a baffle and snap the mesh onto it. It has the advantage that I get a nice flat cut, but it fails snapping on the baffle if I have some kind of geometry meshed inside the sphere. At the moment, I gave up on this approach.
2) split the mesh in zones. Every cell belong then to either one side or the other side of the plane used to define the zones. It has the advantage that it does not fail on splitting the cells in two zones, but the interface between the zones is ragged which leads to numerical instabilities. The attached figure illustrates the pressure variations due to the ragged interface.

For this second approach, I'd like to extrude the ragged patch to a flat surface. I found extrudeMesh, but it seems to keep the patch geometry while extruding it. So I might rather need a tool which "projects" my ragged patch to a flat plate. Has someone any idea of how to do that?

Other wise, all suggestions to cut a mesh without loosing too much of its quality are welcome

Many thanks,
Eloïse