Karthik R
Hello,nYou should be able to use the Fluent Meshing for this. Fluent meshing can wrap around your surface mesh and help create the volume mesh. nThis video should help you understand the capability (might not be an exact workflow for your problem though).nTo be honest, it might be much easier to recreate the geometry since your domain is the region between two surfaces of a sphere. The workflow would be much simpler if you had a solid CAD file.nKarthikn