On Fri, 30 Jul 2010, Boyce Griffith wrote: > I'm trying to setup a simple empirical grid convergence study in > libMesh, and was hoping you all could point me in the right direction. > Specifically, if I have a solution on a coarse Cartesian grid, and a > solution on a fine Cartesian grid which is a factor of two finer than > the coarse grid, is there a mechanism in libMesh that would allow me to > restrict the fine grid solution onto the coarse mesh so that I may > compute norms of differences between the coarse and fine solutions?
You ought to integrate your norms on the fine grid (otherwise you may get a fraction of your approximation error but only after having thrown away all your interpolation error), and you can do so with the ExactSolution class. That class currently only has functions for returning norms in one variable at a time; if you've got a multiphysics system and want to be able to calculate a SystemNorm based result then we'd be happy to have a patch. ;-) --- Roy ------------------------------------------------------------------------------ The Palm PDK Hot Apps Program offers developers who use the Plug-In Development Kit to bring their C/C++ apps to Palm for a share of $1 Million in cash or HP Products. Visit us here for more details: http://p.sf.net/sfu/dev2dev-palm _______________________________________________ Libmesh-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/libmesh-users
