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 > >>> _______________________________________________ > >>> DOLFIN-dev mailing list > >>> [email protected] > >>> http://www.fenics.org/mailman/listinfo/dolfin-dev > >> > > > > _______________________________________________ > > DOLFIN-dev mailing list > > [email protected] > > http://www.fenics.org/mailman/listinfo/dolfin-dev > _______________________________________________ > DOLFIN-dev mailing list > [email protected] > http://www.fenics.org/mailman/listinfo/dolfin-dev
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