Configure scheme selected by user
This grammar action configures the number of degrees of freedom (NDOF) used for DG methods. For finite volume (or DGP0), the DOF are the cell-averages. This implies ndof=1 for DGP0. Similarly, ndof=4 and 10 for DGP1 and DGP2 respectively, since they evolve higher (>1) order solution information (e.g. gradients) as well. "rdof" includes degrees of freedom that are both, evolved and reconstructed. For rDGPnPm methods (e.g. P0P1 and P1P2), "n" denotes the evolved solution-order and "m" denotes the reconstructed solution-order; i.e. P0P1 has ndof=1 and rdof=4, whereas P1P2 has ndof=4 and rdof=10. For a pure DG method without reconstruction (DGP0, DGP1, DGP2), rdof=ndof. For more information about rDGPnPm methods, ref. Luo, H. et al. (2013). A reconstructed discontinuous Galerkin method based on a hierarchical WENO reconstruction for compressible flows on tetrahedral grids. Journal of Computational Physics, 236, 477-492.