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Abstract and Applied Analysis
Volume 2014 (2014), Article ID 803902, 8 pages
Note on the Convergence Analysis of Homotopy Perturbation Method for Fractional Partial Differential Equations
1Faculty of Science and Technology, Universiti Sains Islam Malaysia (USIM), 71800 Nilai, Malaysia
2Department of Mathematics, Zawia University, Zawia, Libya
3Department of Mathematics and Institute for Mathematical Research, University Putra Malaysia, 43400 Serdang, Selangor, Malaysia
Received 7 September 2013; Revised 12 November 2013; Accepted 3 December 2013; Published 22 January 2014
Academic Editor: Hossein Jafari
Copyright © 2014 Asma Ali Elbeleze 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.
We apply the homotopy perturbation method to obtain the solution of partial differential equations of fractional order. This method is powerful tool to find exact and approximate solution of many linear and nonlinear partial differential equations of fractional order. Convergence of the method is proved and the convergence analysis is reliable enough to estimate the maximum absolute truncated error of the series solution. The fractional derivatives are described in the Caputo sense. Some examples are presented to verify convergence hypothesis and simplicity of the method.
Recently, the partial differential equations of fractional order have attracted much attention. This is mostly due to their frequent appearance in many applications in fluid mechanics, viscoelastic, biology, engineering, and physics [1, 2].
Most of partial differential equations of fractional order do not have exact analytical solution, so approximations and numerical techniques must be used. Some of these methods are series solution methods which include Adomain decomposition method , homotopy analysis method [4, 5], variationalmiteration method , and homotopy perturbation method [7–9]. The homotopy perturbation method  proposed by He in 1998. This method is useful tool for obtaining exact and approximate solution of linear and nonlinear partial differential equations of fractional order. There is no need for a small parameter or linearization, the solution procedure is very simple, and only few iterations lead to high accurate solutions which are valid for the all solution domains. The solution is expressed as the summation of an infinite series which is supposed to be convergent to the exact solution. This method has been used to solve effectively, easily, and accurately many types of fractional equations of linear and nonlinear problems with approximations. For example,  applied HPM to solve a class of initialboundary value problems of fractional partial differential equations over finite domain.  used HPM for solving the Klein-Gordon partial differential equations of fractional order. Furthermore, many authors applied HPM for solving and investigating linear and nonlinear partial differential equations of fractional ordering; see [13, 14]. For more details about homotopy perturbation method and its applications, we refer to [15, 16].
Our aim in this study is to extend the applications of HPM to obtain approximate solution of some partial differential equations of fractional order such as Burgers’ equation of fractional order and fractional fourth-order parabolic partial differential equation and obtain the convergence of this method.
The paper is organized as follows. In Section 2, some basic definitions and properties of fractional calculus theory are given. In Section 3, the basic idea of HPM is presented. In Section 4, analysis of HPM is given. Some examples are given in Section 5. Concluding remarks are listed in Section 6.
In this section, we give some basic definitions and properties of fractional calculus theory which are used in this paper.
Definition 1. A real function , is said to be in space , if there exists a real number , such that where , and it is said to be in the space if ,
Definition 2. The Riemann-Liouville fractional integral operator of order of a function , is defined as
in particular .
For and . The operator has the following properties(1), (2), (3).
Definition 3. The Caputo fractional derivative of , , is defined as
Lemma 4. If , , , , then the following two properties hold(1), (2).
3. Homotopy Perturbation Method
To illustrate the basic idea of this method, we consider the following nonlinear differential equation: with boundary conditions where is a general differential operator, is a boundary operator, is a known analytic function, and is the boundary of the domain .
In general, the operator can be divided into two parts and , where is linear, while is nonlinear. Equation (3) therefor can be rewritten as follows: By the homotopy technique [10, 17] we construct a homotopy which satisfies or where is an embedding parameter and is an initial approximation of (3) which satisfies the boundary conditions.
4. Analysis on Convergence and Solution
Consider the following fractional partial differential equations: where is Caputo fractional derivative of order , , for every . Consider that is a continuous mapping. exists with continuous and bounded derivatives satisfing the Lipschitz condition where is Lipschitz constant.
To illustrate the basic concepts of HPM for fractional partial differential equation (11) with the initial conditions (12), we construct the following homotopy for (11): or Substituting (9) into (15) and equating the terms with having identical power of , we obtain the following series of equations: Operating with Riemann-Liouville fractional operator , which is the inverse operator of Caputo derivative in both sides of (16) the solution The solution of (11) in series form is given by Define that is the Banach space, the space of all continuous functions on with the norm
4.1. Existence and Uniqueness of Solutions
Proof. Let and be two different solutions of (11), and for All and is bounded. Let ; then, Since , then ; therefore, , and this completes the proof.
4.2. Proof of the Convergence
Proof. Suppose that is the sequence of partial sums of the series (18) and we need to show that is a Cauchy sequence in Banach space . For this, we consider Now, for every , , there are two arbitrary partial sums and ; by using (21) and triangle inequality successively, we have Since , we have ; then, Since is bounded, Therefore, is a Cauchy sequence in , so the series converges and the proof complete.
4.3. Error Estimate
Example 8. Consider the following fractional partial differential equations with initial condition:
with the exact solution at special case
To solve (28) with initial condition (29), according to the homotopy perturbation technique, we construct the following homotopy:
Substituting of (9) in (32) and then equating the terms with same powers of , we get the series
Operating with Riemann-Liouville fractional operator , which is the inverse operator of Caputo derivative in both sides of (28), the solution reads
Since , and , and according to Theorem 6, we have
And so on, finally we get Therefore, ; that is, is, a Cauchy sequence.
Then the approximate solution in a series form is
Example 9. Consider the fourth-order parabolic partial differential equation of fractional order
subject to the initial conditions
The exact solution for special case is
For solving (38), according the homotopy perturbation method, we have
By applying in both sides of (41), we got
According to Theorem 6, we have But for all and , we have Thus, Since, for all , , and , we have Thus where .
And so on, finally we get Since, for all , , and , we have Thus, where . Therefore, That is is a Cauchy sequence.
The series of the solution is
In this paper, we applied the HPM for fractional partial differential equations and obtained highly approximate solutions with few iterations. Further, we introduce the study problem of convergence of HPM. The sufficient condition for convergence of this method has been presented. In this paper, we studied the convergence analysis of homotopy perturbation method for fractional partial differential equations, Further, we consider the convergence analysis of homotopy perturbation method for fractional integro-differential equations as future work.
The convergence analysis is reliable enough to estimate the maximum absolute truncation error of the series solution.
Conflict of Interests
The authors declare that there is no conflict of interests regarding the publication of this paper.
The authors are very grateful to the referees for their valuable suggestions and comments that improved the paper.
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