1. Variational formulation for fractional inhomogeneous boundary value problems
- Author
-
Beiping Duan, Taibai Fu, and Zhoushun Zheng
- Subjects
Steady state ,Computer Networks and Communications ,Applied Mathematics ,Boundary problem ,Boundary (topology) ,010103 numerical & computational mathematics ,01 natural sciences ,Dirichlet distribution ,Finite element method ,Term (time) ,010101 applied mathematics ,Computational Mathematics ,symbols.namesake ,symbols ,Applied mathematics ,Boundary value problem ,0101 mathematics ,Convection–diffusion equation ,Software ,Mathematics - Abstract
The steady state fractional convection diffusion equation with inhomogeneous Dirichlet boundary is considered. By utilizing standard boundary shifting trick, a homogeneous boundary problem is derived with a singular source term which does not belong to $$L^2$$ anymore. The variational formulation of such problem is established, based on which the finite element approximation scheme is developed. Inf-sup conditions for both continuous case and discrete case are demonstrated thus the corresponding well-posedness is verified. Furthermore, rigorous regularity analysis for the solutions of both original equation and dual problem is carried out, based on which the error estimates for the finite element approximation are derived. Numerical results are presented to illustrate the theoretical analysis.
- Published
- 2020