Anisotropic residual based a posteriori mesh adaptation in 2D: Element based approach

An element-based adaptation method is developed for an anisotropic a posteriori error estimator. The adaptation does not make use of a metric, but instead equidistributes the error over elements using local mesh modifications. Numerical results are reported, comparing with three popular anisotropic adaptation methods currently in use. It was found that the new method gives favourable results for controlling the energy norm of the error in terms of degrees of freedom at the cost of increased CPU usage. Additionally, we considered a new L2 variant of the estimator. The estimator is shown to be conditionally equivalent to the exact L2 error. We provide examples of adapted meshes with the L2 estimator, and show that it gives greater control of the L2 error compared with the original estimator.