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$P_NP_M$ DG scheme; piecewise polynomial; projection; reconstruction; least square; local continuous space time Galerkin method; discontinuous Galerkin; advection equation; conservation law; von Neumann stability analysis; time discretization
We give a proof of the existence of a solution of reconstruction operators used in the $P_NP_M$ DG schemes in one space dimension. Some properties and error estimates of the projection and reconstruction operators are presented. Then, by applying the $P_NP_M$ DG schemes to the linear advection equation, we study their stability obtaining maximal limits of the Courant numbers for several $P_NP_M$ DG schemes mostly experimentally. A numerical study explains how the stencils used in the reconstruction affect the efficiency of the schemes.
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