dolfin team mailing list archive

[Anders Logg <logg@xxxxxxxxx>]

On Mon, Dec 01, 2008 at 04:33:12PM +0000, Garth N. Wells wrote:
> 
> 
> Bartosz Sawicki wrote:
> > On 01/12/08 09:07 AM, Garth N. Wells wrote:
> >>
> >> Bartosz Sawicki wrote:
> >>> Hi all,
> >>>
> >>> I can't find anything in the manuals, any example in the demo 
> >>> directory and even google is silent like a grave, when asked for 
> >>> "anisotropy site:fenics.org".
> >>> Does it mean that anisotropy is not supported by FEniCS?
> >>>
> >> Can you be more specific on what you have in mind?
> > 
> > My question is, if anyone has already tried to solve any anisotropic 
> > problem with fenics?
> > 
> > One of the problems, which come to my mind is that for anisotropic 
> > material I need at tensor function for material property. Can FFC handle 
> > this?
> > 
> 
> Just define the equation you want to solve and try compiling it with 
> FFC. For an anisotropic solid, part of this will involve defining the 
> constitutive model. The DOLFIN library shouldn't need to be (nor should 
> it be) aware of the details of the constitutive model.
> 
> Garth

Also, look at demo/TensorWeightedPoisson.form in FFC for how to
implement a tensor-field using a vector-field.

FFC does not support tensor-elements, only scalars and vectors, so you
need to represent tensors by flattening them to vectors. This will be
(much) better supported once we move to UFL.

-- 
Anders


> > BArtek
> > 
> > 
> >> Garth
> >>
> >>> Strange, this seams to be quite easy to develop. Or maybe just no one 
> >>> needed that feature so far.
> >>>
> >>> BArtek
> >>> _______________________________________________
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> >>> DOLFIN-dev@xxxxxxxxxx
> >>> http://www.fenics.org/mailman/listinfo/dolfin-dev
> >>
> > 
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