We here propose a lightning Virtual Element Method that aims to get rid of the stabilisation term by actually computing the virtual component of the local VEM basis functions using a lightning approximation.
In particular, the lightning VEM approximates the virtual part of the basis functions using rational functions with poles clustered exponentially close to the corners of each element of the polynomial tessellation.
This results in two great advantages, first the mathematical analysis of a priori error estimates is much easier and essentially identical to the one for any other nonconforming Galerkin discretisation.
Furthermore, the fact that the lightning VEM truly computes the basis functions allows the user to access the point-wise value of the numerical solution without needing any reconstruction techniques.
The cost of the local construction of the VEM basis is the implementation price that one has to pay for the advantages of the lightning VEM method, but the embarrassingly parallelizable nature of this operation will ultimately result in a cost-efficient scheme compared to standard VEM and FEM.
New features
- Support linear elasticity discretisations;
- Support for eigenvalue problems;