Hello Fenics project community,
I have followed the implementation from the book “Jian-ming Jin - The finite element method in electromagnetics-John Wiley & Sons ( 2014)” for the Maxwell eigenvalue problem using Nedelec elements for the transversal field components and Lagrange elements for the longitudinal component.
My solver gives me initial good results for a cylindrical waveguide structure, but when I try to refine my mesh to improve my solution I cannot get to reduce the computed error in a consistent way.
I am using the following error estimator:
From: (Residual-based a posteriori error estimation for the Maxwell’s eigenvalue problem - By Daniele Boffi)
I select a number of mesh elements to be refined based on the error estimator, for which the global error that I obtain for each iteration does not decrease in a constant way.
Do you have any recommendations on what strategy could use for refining my mesh? Or what other type of error estimator could I use?
In advance, many thanks for your kind help and comments.