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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