Analysis of generalised alternating local discontinuous Galerkin method on layer-adapted mesh for singularly perturbed problems

CALCOLO ◽  
2021 ◽  
Vol 58 (4) ◽  
Author(s):  
Yao Cheng ◽  
Yanjie Mei
Keyword(s):  
Galerkin Method ◽  
Discontinuous Galerkin ◽  
Discontinuous Galerkin Method ◽  
Local Discontinuous Galerkin Method ◽  
Singularly Perturbed ◽  
Singularly Perturbed Problems ◽  
Local Discontinuous Galerkin

Local Discontinuous Galerkin Method for Time-Dependent Singularly Perturbed Semilinear Reaction-Diffusion Problems

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Yao Cheng ◽  
Chuanjing Song ◽  
Yanjie Mei
Keyword(s):  
Galerkin Method ◽  
Discontinuous Galerkin ◽  
Discontinuous Galerkin Method ◽  
Domain Boundary ◽  
Local Discontinuous Galerkin Method ◽  
Singularly Perturbed ◽  
Time Dependent ◽  
Element Space ◽  
Local Discontinuous Galerkin ◽  
Ldg Method

AbstractLocal discontinuous Galerkin method is considered for time-dependent singularly perturbed semilinear problems with boundary layer. The method is equipped with a general numerical flux including two kinds of independent parameters. By virtue of the weighted estimates and suitably designed global projections, we establish optimal {(k+1)}-th error estimate in a local region at a distance of {\mathcal{O}(h\log(\frac{1}{h}))} from domain boundary. Here k is the degree of piecewise polynomials in the discontinuous finite element space and h is the maximum mesh size. Both semi-discrete LDG method and fully discrete LDG method with a third-order explicit Runge–Kutta time-marching are considered. Numerical experiments support our theoretical results.

Sign in / Sign up

Export Citation Format

Share Document