ufl team mailing list archive

["Martin Sandve Alnæs" <martinal@xxxxxxxxx>]

UFL supports absolute values of any scalar expression.

Martin



On Wed, Dec 31, 2008 at 8:46 PM, Garth N. Wells <gnw20@xxxxxxxxx> wrote:
> Since FFC is about to move to UFL, I guess this is the best place to ask
>  certain questions now ;).
>
> Will UFL support the absolute value of sums, e.g.
>
>   vector = VectorElement("Lagrange", "tetrahedron", 1)
>   scalar = Element("Lagrange", "tetrahedron", 1)
>   v = TestFunction(scalar)
>   u = Function(vector)
>   n = Function(vector)
>
>   L =  v*abs(inner(u, n))*ds
>
> This would be useful for upwinding fluxes.
>
> Garth
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