Hi all,

New to firedrake, I am building a test problem for a new PhD which is poro-elastic consolidation of a sphere, I want to apply a pressure boundary (Neumann) condition to a curved surface.

I.e \int (\sigma \dot n) \dot v\; ds

Where n is the normal vector to the surface ds.

Is there a function normal() which returns it for me. A look a documentation doesn’t look promising!

Cheers

Tim