We study stability and convergence of hp-streamline diffusion (SD) finite element, and Nitsche's schemes for the three dimensional, relativistic (3 spatial dimension and 3 velocities), time dependent Vlasov-Maxwell system and Maxwell's equations, respectively. For the hp scheme for the Vlasov-Maxwell system, assuming that the exact solution is in the Sobolev space H s+1 (Ω), we derive global a priori error bound of order O(h/p) s+1/2 , where h(= max K h K ) is the mesh parameter and p(= max K p K ) is the spectral order. This estimate is based on the local version with h K = diam K being the diameter of the phase-space-time element K and p K is the spectral order (the degree of approximating finite element polynomial) for K. As for the Nitsche's scheme, by a simple calculus of the field equations, first we convert the Maxwell's system to an elliptic type equation. Then, combining the Nitsche's method for the spatial discretization with a second order time scheme, we obtain optimal convergence of O(h 2 + k 2 ), where h is the spatial mesh size and k is the time step. Here, as in the classical literature, the second order time scheme requires higher order regularity assumptions.Numerical justification of the results, in lower dimensions, is presented and is also the subject of a forthcoming computational work [20].
In this paper we study stability and convergence for hp-streamline diffusion (SD) finite element method for the, relativistic, timedependent Vlasov-Maxwell (VM) system. We consider spatial domain X x & R 3 and velocities v 2 X v & R 3 : The objective is to show globally optimal a priori error bound of order Oðh=pÞ sþ1=2 , for the SD approximation of the VM system; where h ð¼ max K h K Þ is the mesh size and p ð¼ max K p K Þ is the spectral order. Our estimates rely on the local version with h K being the diameter of the phase-space-time element K and p K the spectral order for K. The optimal hp estimates require an exact solution in the Sobolev space H sþ1 ðXÞ: Numerical implementations, performed for examples in one space-and two velocity dimensions, are justifying the robustness of the theoretical results.
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