scholarly journals A fitted deviating argument and interpolation scheme for the solution of singularly perturbed differential-difference equation having layers at both ends

2021 ◽  
Keyword(s):  
Difference Equation ◽  
Singularly Perturbed ◽  
Interpolation Scheme ◽  
Deviating Argument ◽  
Differential Difference Equation

Spline approximation method for singularly perturbed differential-difference equation on nonuniform grids

2020 ◽  
pp. 2150005
Author(s):  
P. Mushahary ◽  
S. R. Sahu ◽  
J. Mohapatra
Keyword(s):  
Difference Equation ◽  
Spline Approximation ◽  
Perturbation Parameter ◽  
Shishkin Mesh ◽  
Second Order ◽  
Singularly Perturbed ◽  
Nonuniform Grids ◽  
Fine Mesh ◽  
Differential Difference Equation ◽  
Perturbed Differential Equation

In this paper, a second-order singularly perturbed differential-difference equation involving mixed shifts is considered. At first, through Taylor series approximation, the original model is reduced to an equivalent singularly perturbed differential equation. Then, the model is treated by using the hybrid finite difference scheme on different types of layer adapted meshes like Shishkin mesh, Bakhvalov–Shishkin mesh and Vulanović mesh. Here, the hybrid scheme consists of a cubic spline approximation in the fine mesh region and a midpoint upwind scheme in the coarse mesh region. The error analysis is carried out and it is shown that the proposed scheme is of second-order convergence irrespective of the perturbation parameter. To display the efficacy and accuracy of the proposed scheme, some numerical experiments are presented which support the theoretical results.

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