On Tue, Feb 03, 2009 at 12:40:16AM -0700, Bartosz Sawicki wrote: > Hi all, > > Have any of you, some experience with posteriori error estimation in > Dolfin? I'm playing with adaptive refinement techniques, where proper > error estimation is essential. > I try to use form language with discontinous Lagrange elements to > describe error, but the results are somehow strange. > I found that in Unicorn there are some error estimation code, but I > can't find any application of it or any example? Is this code working? > > regrd. > BArtek
What is currently missing is the ability to evaluate integrands over cells and facets and not adding the results. This is a fairly straightforward extension of our current assembly algorithms and it's partly there already (additional argument values to assemble_cells). In the meantime, it's possible to evaluate at least the cell contribution by multiplying with a DG test function. We do this all the time and it works fine. There will be much improved support for a posteriori error estimation in future versions, including automated generation of dual problems and error estimators as part of UFL, although I can't promise when. -- Anders
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