Application of homotopy perturbation method for solving eighth-order boundary value problems
Introduction
A new perturbation method called homotopy perturbation method (HPM) was proposed by He in 1997 and systematical description in 2000 which is, in fact, a coupling of the traditional perturbation method and homotopy in topology [1]. This new method was further developed and improved by He and applied to nonlinear oscillators with discontinuities [2], nonlinear wave equations [3], asymptotology [4], boundary value problem [5], Limit cycle and bifurcation of nonlinear problems [6] and many other subjects. Thus He’s method is a universal one which can solve various kinds of nonlinear equations. For example, it was applied to the quadratic Ricatti differential equation by Abbasbandy [7]; to the axisymmetric flow over a stretching sheet by Ariel et al. [8]; to the nonlinear systems of reaction–diffusion equations by Ganji and Sadighi [9]; to the Helmholtz equation and fifth-order KdV equation by Rafei and Ganji [10]; for the thin film flow of a fourth grade fluid down a vertical cylinder by Siddiqui et al. [11]; to the nonlinear Voltra–Fredholm integral equations by Ghasemi et al. [12]. Recently various powerful mathematical methods such as variational iteration method [13], [14], [15], [16], [17], [18], [19], [20], [21], Exp-function method [22], [23], F-expansion method [24], Adomian decomposition method [25] and others [26], [27] have been proposed to obtain exact and approximate analytic solutions for linear and nonlinear problems.
In this paper, we consider the general eighth-order boundary value problems of the type:with boundary conditionswhere f is continuous function on [a,b] and the parameters and are real constants.
Such type of boundary value problems arise in the mathematical modeling of the viscoelastic flows and other branches of mathematical, physical and engineering sciences, see [28], [29], [30], [31] and references therein. Several numerical methods including spectral Galerkin and collocation [29], [30], sixth B-spline method [28], decomposition method [32], spline collocation approximation [33], Chow–Yorke algorithm [34] and others [35], [36] have been developed for solving the problem of type (1). This paper, applies the homotopy perturbation method [1], [2], [3], [4], [5], [6], [7], [8], [9], [10], [11], [12] to the discussed problem.
Section snippets
Homotopy perturbation method
Using the transformationwe can rewrite the eighth-order boundary value problem (1), (2) as the system of ordinary differential equations:with the boundary conditionswhich can be written as a system of integral equations:
Applications
In this section, in order to verify numerically whether the proposed methodology leads to higher accuracy, we evaluate the numerical solution of the problem (1). To show the efficiency of the present method for our problem in comparison with the exact solution we report absolute error which is defined bywhere for N = 0, 1, 2, …. Example 1 Consider the following linear eighth-order problem [32]with the following boundary conditions:
Conclusions
Homotopy perturbation method is applied to the numerical solution for solving eighth-order boundary value problems. Comparison of the result obtained by the present method with that obtained by modified decomposition method [32] reveals that the present method is very effective and convenient.
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