[firedrake] extruded circle mesh problem

[Shipton, Jemma]

Hello,

I'm trying to solve a problem that works on an extruded periodic interval mesh on an extruded circle mesh. I am getting the following error:

Traceback (most recent call last):
  File "extruded_circle_helmholtz.py", line 57, in <module>
    bcs = [DirichletBC(W[0], Expression(("0.", "0.")), "bottom"),
  File "/home/jemma/src/firedrake/firedrake/bcs.py", line 56, in __init__
    self.function_arg = g
  File "/home/jemma/src/firedrake/firedrake/bcs.py", line 95, in function_arg
    g = function.Function(self._function_space).interpolate(g)
  File "/home/jemma/src/firedrake/firedrake/function.py", line 182, in interpolate
    % (sum(dims), np.prod(expression.value_shape(), dtype=int)))
RuntimeError: Expression of length 3 required, got length 2

The problem appears to be that the mesh coordinates have 3 components whereas the extruded interval mesh coordinates only have 2. Any idea how to fix?

My code is here:

https://gist.github.com/anonymous/dff509883518ef0f5f2d

Thanks!

Jemma
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