Dear Firedrakers,

I’m constructing a DG space on an extruded mesh.

meshbase = RectangleMesh(Nx, Ny, Lx, Ly, quadrilateral=True)
mesh = ExtrudedMesh(meshbase, Nz, Delta_z)
horiz_elt = FiniteElement("DG", quadrilateral, 0)
vert_elt = FiniteElement("DG", interval, 0)
elt = OuterProductElement(horiz_elt, vert_elt)

DG = FunctionSpace(mesh, elt)

W=DG*DG

Now I would like to impose Dirchlet BC on one of the boundaries.

I tried

bc0 = DirichletBC(W.sub(0), Expression("1.0e7"), 2,method="geometric")

and get a

ValueError: Geometric boundary conditions are not yet supported on extruded meshes

Using the standard topological way, seems to have no effect at all.

Is there a way around this? I would be fine with fixing the value on the most outer cell layer, if that is possible…

Henrik

Dipl.-Math. Henrik Büsing

Institute for Applied Geophysics and Geothermal Energy

E.ON Energy Research Center

RWTH Aachen University

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52074 Aachen, Germany | Fax +49 (0)241 80 49889

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http://www.eonerc.rwth-aachen.de/GGE

hbuesing@eonerc.rwth-aachen.de

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