[firedrake] .assign() with a function from a mixed function space

[Hiroe Yamazaki]

Dear all,

I got confused with .assign() with a function from a mixed function
space and I would appreciate some suggestions. The test code is in
bitbucket.org/colinjcotter/slicemodels/branch/tidy revision f87e865.

I expect a non-zero kinetic energy is printed out in line 54, but the
result is still 0. To get an updated kinetic energy, I need line 57.

Am I misunderstanding what .assign() and/or .split() do?

All the best,
Hiroe