dolfin team mailing list archive

[Anders Logg <logg@xxxxxxxxx>]

On Thu, Jun 25, 2009 at 11:26:50AM +0100, Nuno David Lopes wrote:
> Hi!
> 
> Is there any demo/sandbox  with a problem involving higher-order derivatives? 
> 
> I'm trying to solve some 4th order equations but  with  no successful 
> solutions until know. (This is, 2nd and/or 3th order derivatives in the 
> variational forms.)
> 
> What should be the syntax for the higher order derivatives in the ufl file?   
> I'm using div grad compositions, for instance, div(grad(u)) for the laplacian 
> of u. Everything compiles fine, 

This should work, but I don't know of a demo testing it.

See if you could create a very simple test case that fails.

-- 
Anders

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