On Tue, May 14, 2013 at 9:25 AM, Manav Bhatia <[email protected]> wrote: > Hi, > > I am working on higher-order simulation using the hierarchich function > on quad8s. > > My error-convergence plots give me theoretical convergence for first > and second order p, but the error stagnates for p > 2. I am speculating > that this might be due to the lower-order geometry, assuming that the x- > and y-coordinates are interpolated using Lagrange functions associated with > nodes of quad8.
What does your domain look like? Unit square? If so I don't think there can be errors due to using even bilinear element maps, the Jacobians are linear in this case. What exact solution are you using for testing the convergence? > I am considering adding higher order quads to get x- and > y- interpolation using higher-order Lagrange functions. Any thoughts on how > easy/difficult this might be? You are talking about QUAD16? It shouldn't be too hard but we would need to come to a consesus on node numbering for this element. -- John ------------------------------------------------------------------------------ AlienVault Unified Security Management (USM) platform delivers complete security visibility with the essential security capabilities. Easily and efficiently configure, manage, and operate all of your security controls from a single console and one unified framework. Download a free trial. http://p.sf.net/sfu/alienvault_d2d _______________________________________________ Libmesh-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/libmesh-users
