Re: [Libmesh-users] Dual weighted residual error estimator in libMesh

2016-09-09 Thread Vikram Garg
If you are referring to equation 3.30, yes this should be a good estimator for the L2 error once the constant C has been obtained. The duality trick (Aubin-Nitsche) gives us the extra powers of h, which we expect to see in the L2 convergence. On Fri, Sep 9, 2016 at 5:44 PM, Salazar De Troya, Migue

Re: [Libmesh-users] Dual weighted residual error estimator in libMesh

2016-09-09 Thread Salazar De Troya, Miguel
I found an error estimator in the L2 norm here: https://www.ices.utexas.edu/sites/oden/wp-content/uploads/2013/06/1997-006.a_posteriori.pdf , Pag 23. Is this a good error estimator to use or is it the forward euler of the error indicators? Thanks From: mailto:simulation...@gmail.com>> on behal

Re: [Libmesh-users] Dual weighted residual error estimator in libMesh

2016-09-09 Thread Vikram Garg
Hello Salazar, On Fri, Sep 9, 2016 at 1:49 PM, Salazar De Troya, Miguel < salazardet...@llnl.gov> wrote: > My problem with patch recovery is that it cannot be used across an > interface where the gradient is discontinuous. > I would say that even in cases where the gradient is discontinuous, pat

Re: [Libmesh-users] Dual weighted residual error estimator in libMesh

2016-09-09 Thread Salazar De Troya, Miguel
My problem with patch recovery is that it cannot be used across an interface where the gradient is discontinuous. I also see that one has to be careful when using other error indicators because they might be designed for the error in the energy norm or the complete H1 norm, whereas your weightin