Understanding the Cahn-Hilliard demo: dimensions of mesh.

Question

Hi,

I've been looking at the Cahn-Hilliard demo here:

http://fenicsproject.org/documentation/dolfin/dev/python/demo/pde/cahn-hilliard/python/documentation.html

What are the units of the mesh / dimensions of Ω? Are they the same as λ? How would someone go about relating the output of this demo to a real-world system?

Thanks!

Answer 1

The mesh in the demo is:

mesh = UnitSquareMesh(96, 96)

As the name says, it's a unit square ($(0, 1) \times (0, 1)$). FEniCS knows nothing about units. That part is up to you.