Jia-Shu Lu

A mesh- and horizon-robust preconditioner for finite element discretizations of volume-constrained nonlocal diffusion problems

In this paper, we develop a preconditioner that is robust with respect to both the mesh size and the interaction horizon for finite element discretizations of volume-constrained nonlocal diffusion problems. Motivated by the Fourier multiplier of the nonlocal operator, we construct the preconditioner $B_h=G_h+\beta\delt...