Nonlinear Problems: Analytical and Computational Approach with Applications
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Numerical Simulation of Fractional FornbergWhitham Equation by Differential Transformation Method
Abstract
An approximate analytical solution of fractional FornbergWhitham equation was obtained with the help of the twodimensional differential transformation method (DTM). It is indicated that the solutions obtained by the twodimensional DTM are reliable and present an effective method for strongly nonlinear partial equations. Exact solutions can also be obtained from the known forms of the series solutions.
1. Introduction
A homogeneous nonlinear fractional FornbergWhitham equation [1] is considered as in the following form: with boundary conditions and with initial conditions where is the fluid velocity, is constant and lies in the interval , is the time and is the spatial coordinate.
Subscripts denote the partial differentiation unless stated otherwise. Fornberg and Whitham obtained a peaked solution of the form , where is an arbitrary constant. In recent years, considerable interest in fractional calculus used in many fields such as electrical networks, control theory of dynamical systems, probability and statistics, electrochemistry of corrosion, chemical physics, optics, engineering, accustics, material science, and signal processing can be successfully modelled by linear or nonlinear fractional order differential equations [2–8].
See fractional diffusion equation with absorbent term and external force by Das and Gupta [9], fractional convectiondiffusion equation with nonlinear source term by Momani and Yıldırım [10], spacetime fractional advectiondispersion equation by Yıldırım and Koçak [11], fractional ZakharovKuznetsov equations by Yıldırım and Gülkanat [12], boundary value problems by He [13], integrodifferential equation by ElShahed [14], nonNewtonian flow by Siddiqui et al. [15], fractional PDEs in fluid mechanics by Yıldırım [16], fractional Schrödinger equation [17, 18] and nonlinear fractional predatorprey model [19] by HPM, linear PDEs of fractional order by He [20], Momani, and Odibat [21], and so forth. In 2009, Tian and Gao [22] studied the proof of the existence of the attractor for the onedimensional viscous FornbergWhitham equation. Abidi and Omrani [23] have solved the FornbergWhitham equation by the homotopy analysis method. Recently, Gupta and Singh [24] have used homotopy perturbation method to numerical solution of fractional FornbergWhitham Equation.
The goal of this paper is to extend the twodimensional differential transform method to solve fractional FornbergWhitham equation.
This paper is organized as follows.
In Section 2, we are giving definitions related to the fractional calculus theory briefly. To show in efficiency of this method, we give the implementation of the DTM for the FornbergWhitham equation and numerical results in Sections 3 and 4. The conclusions are then given in the final Section 5.
2. Basic Definitions
Here are some basic definitions and properties of the fractional calculus theory which can be found in [5, 6, 25, 26].
Definition 2.1. A real function , in the space , if there exists a real number , such that , where and it is said to be in the space if , .
Definition 2.2. The leftsided RiemannLiouville fractional integral operator of order , of a function is defined as The properties of the operator can be found in Jang et al. [25].
Definition 2.3. The fractional derivative of in the Caputo [6] sense is defined as The unknown function is assumed to be a casual function of fractional derivatives (i.e., vanishing for ) taken in Caputo sense as follows.
Definition 2.4. For as the smallest integer that exceeds , the Caputo timefractional derivative operator of order is defined as
3. TwoDimensional Differential Transformation Method
DTM is an analytic method based on the Taylor series expansion which constructs an analytical solution in the form of a polynomial. The traditional high order Taylor series method requires symbolic computation. However, the DTM obtains a polynomial series solution by means of an iterative procedure. The method is well addressed by Odibat and Momani [26]. The proposed method is based on the combination of the classical twodimensional DTM and generalized Taylor’s Table 1 formula. Consider a function of two variables and suppose that it can be represented as a product of two singlevariable functions, that is, . The basic definitions and fundamental operations of the twodimensional differential transform of the function are expressed as follows [25–38]. Twodimensional differential transform of can be represented as: where , is called the spectrum of . The generalized twodimensional differential transform of the function is given by where .

In case of , and , the generalized twodimensional differential transform (3.2) reduces to the classical twodimensional differential transform.
From the above definitions, it can be found that the concept of twodimensional differential transform is derived from twodimensional differential transform which is obtained from twodimensional Taylor series expansion.
4. The DTM Applied to Fractional FornbergWhitham Equation
In this section, we will research the solution of fractional FornbergWhitham equation, which has been widely examined in the literature. We described the implementation of the DTM for the fractional FornbergWhitham equation in detail. To solve (1.1)–(1.3), according to DTM, (1.2)(1.3) with initial condition become with boundary conditions Applying the differential transform of (1.1), (4.1), and (4.2), then Substituting (4.3) into (4.4), we obtain the closed form solution as As , this series has the closed form , which is an exact solution of the classical gas dynamics equation.
The graphs of exact and DTM solutions belonging to examples examined above are shown in Figure 1. It can be deduced that DTM solution corresponds to the exact solutions.
(a)
(b)
(c)
(d)
(e)
(f)
Both the exact results and the approximate solutions obtained for the DTM approximations are plotted in Figure 1. There are no visible differences in the two solutions of each pair of diagrams.
5. Conclusions
In this paper, the applicability of the fractional differential transformation method to the solution of fractional FornbergWhitham equation with a number of initial and boundary values has been proved. DTM can be applied to many complicated linear and strongly nonlinear partial differential equations and does not require linearization, discretization, or perturbation. The obtained results indicate that this method is powerful and meaningful for solving the nonlinear fractional FornbergWhitham type differential equations.
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Copyright © 2012 Mehmet Merdan et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.