A third (fourth) order stable computational scheme for 2D Burgers type
nonlinear parabolic partial differential equations on a non-uniformly
spaced grid network
Abstract
An implicit compact scheme is proposed to approximate the solution of
parabolic partial differential equations (PDEs) of Burger’s type in
two-dimensions. These nonlinear PDEs are essential because of the
description of various mechanisms in engineering and physics. The
nonlinear convective and advection are discretized with high-order
accuracy on an arbitrary grid, which results in a family of
high-resolution discrete replacements of given PDEs. The essence of the
new scheme lies in its compact character and two-level single-cell
discretization so that one discrete equation leads to the accuracy of
orders three or four depending upon the choice of the grid network. The
consistency and stability preserving third-order spatial accuracy and
second-order accurate time discretization are described by Fourier
analysis applied to the linearized error equations. The scheme is used
for solving celebrated nonlinear PDEs, such as the non-degenerate
convection-diffusion equation, generalized Burgers-Huxley equation,
Buckley-Leverett equation, and Burgers-Fisher equation. Many
computational results are presented to demonstrate the high-resolution
character of the newly proposed scheme.