I didn't notice any other ill effects. m._ufl_cell = Cell('interval', 1) On 11 November 2014 18:04, Cotter, Colin J <colin.cotter@imperial.ac.uk> wrote:

Is it sufficient to reset ufl_cell to Cell('interval',1), or will that break other stuff?

cheers --cjc ------------------------------ *From:* firedrake-bounces@imperial.ac.uk [firedrake-bounces@imperial.ac.uk] on behalf of Andrew McRae [a.mcrae12@imperial.ac.uk] *Sent:* 11 November 2014 17:50 *To:* firedrake *Subject:* Re: [firedrake] extruded circle mesh problem

Overwriting m.coordinates doesn't change m's "ufl_cell", which remains Cell('interval', 2). This gets used during the extrusion process, leaving you with a mesh that thinks it's in 3 dimensions.

I'm also not sure why you're using Expression(("0.", "0.")) in the DirichletBC, since 0 will suffice.

On 11 November 2014 17:28, Shipton, Jemma <j.shipton@imperial.ac.uk> wrote:

...

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