Hi all, For adaptive mesh refinement, an error estimator has to be used to approximately evaluate the errors in each element in order to determine which element is going to be refined. My question is which error estimator should be used in the mixed FEM formulations, for example, Stokes equation with u-p formulation. I read Bathe KJ's review paper: A posteriori error estimation techniques in practical finite element analysis, Computer & Structures 2005 p 235-265. in which they suggested another local error indicator.
I did try kelly and patch recovery, and they are useful to locate the singular region and refine the mesh near the singularity. But the error norms become larger and larger with the refinement. It seems that the numerical solution is not convergent with mesh refinement. Following the question above, The second question I have is that if this non-convergence is caused by wrong error estimator in mixed fem or by intrinsic singularity of the problem I studied? For example, solving stokes equation with a point force in the body. Thank you very much for your comments. Xujun ------------------------------------------------------------------------------ Comprehensive Server Monitoring with Site24x7. Monitor 10 servers for $9/Month. Get alerted through email, SMS, voice calls or mobile push notifications. Take corrective actions from your mobile device. http://p.sf.net/sfu/Zoho _______________________________________________ Libmesh-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/libmesh-users
