[firedrake] Concatenation of function spaces?

[Lawrence Mitchell]

> On 24 Jul 2015, at 12:13, Justin Chang <jychang48 at gmail.com> wrote:
> 
> Hi Lawrence,
> 
> Thanks for the responses (and same to you Fabio). I am attempting to experiment with slip condition dirichlet boundary conditions for velocity with these lines:
> 
> bcs1 = DirichletBC(W.sub(0).sub(0), Expression(("2*pi*cos(2*pi*x[0])*sin(2*pi*x[1])*sin(2*pi*x[2])")), (1,2))
> bcs2 = DirichletBC(W.sub(0).sub(1), Expression(("2*pi*sin(2*pi*x[0])*cos(2*pi*x[1])*sin(2*pi*x[2])")), (3,4))
> bcs3 = DirichletBC(W.sub(0).sub(2), Expression(("2*pi*sin(2*pi*x[0])*sin(2*pi*x[1])*cos(2*pi*x[2])")), (5,6))
> 
> but I am getting these errors:
> 
> Traceback (most recent call last):
>   File "Compare_P2P0.py", line 66, in <module>
>     solver.solve()
>   File "<string>", line 2, in solve
>   File "/home/justin/Software/firedrake-deps/PyOP2/pyop2/profiling.py", line 203, in wrapper
>     return f(*args, **kwargs)
>   File "/home/justin/Software/firedrake-deps/firedrake/firedrake/variational_solver.py", line 165, in solve
>     bc.apply(self._problem.u)
>   File "<string>", line 2, in apply
>   File "/home/justin/Software/firedrake-deps/PyOP2/pyop2/profiling.py", line 203, in wrapper
>     return f(*args, **kwargs)
>   File "/home/justin/Software/firedrake-deps/firedrake/firedrake/bcs.py", line 199, in apply
>     raise RuntimeError("%r defined on incompatible FunctionSpace!" % r)
> RuntimeError: Coefficient(MixedElement(*[VectorElement('Lagrange', Domain(Coefficient(VectorElement('Lagrange', Domain(Cell('tetrahedron', 3), label=None, data='<data with id 140068500682768>'), 1, dim=3, quad_scheme=None), 1)), 2, dim=3, quad_scheme=None), FiniteElement('Discontinuous Lagrange', Domain(Coefficient(VectorElement('Lagrange', Domain(Cell('tetrahedron', 3), label=None, data='<data with id 140068500682768>'), 1, dim=3, quad_scheme=None), 1)), 0, quad_scheme=None)], **{'value_shape': (4,) }), 7) defined on incompatible FunctionSpace!


Oh, I think I failed to correctly implement this case.  I'll try and put something together.

Lawrence

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