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Abstract and Applied Analysis

Volume 2014 (2014), Article ID 284967, 4 pages

http://dx.doi.org/10.1155/2014/284967

## Analytical Solutions of Fractional Differential Equations Using the Convenient Adomian Series

^{1}State Key Laboratory of Oil and Gas Reservoirs Geology and Exploration, Southwest Petroleum University, Chengdu 610500, China^{2}State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resources and Hydropower, Sichuan University, Chengdu 610500, China^{3}Key Laboratory of Numerical Simulation of Sichuan Province and College of Mathematics and Information Science, Neijiang Normal University, Neijiang 641112, China^{4}School of Mathematics and Information Science, Guangxi University, Nanning 530004, China

Received 6 April 2014; Revised 6 May 2014; Accepted 6 May 2014; Published 19 May 2014

Academic Editor: Dumitru Baleanu

Copyright © 2014 Xiang-Chao Shi 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.

#### Abstract

Due to the memory trait of the fractional calculus, numerical or analytical solution of higher order becomes very difficult even impossible to obtain in real engineering problems. Recently, a new and convenient way was suggested to calculate the Adomian series and the higher order approximation was realized. In this paper, the Adomian decomposition method is applied to nonlinear fractional differential equation and the error analysis is given which shows the convenience.

#### 1. Introduction

The fractional calculus has frequently appeared in various applied areas and has become an increasing interesting topic in the past decades [1–7]. Many efforts to analytical and numerical methods have been made. The often used numerical methods are the fractional difference method [8–10] and the predictor corrector method [11–13] and others as well as the analytical methods such as the variational iteration method (VIM) [14–17] and the Adomian decomposition method (ADM) [17–21] and others.

In fact, these methods are developed from original versions for ordinary differential equation of the integer order equation. Compared with the ordinary calculus, the fractional calculus has the long interaction traits or the so-called memory effects; this characteristic can better depict various nonlinear dynamics in both theories and engineering mathematical modeling. However, it also results in finding the solution to the fractional models. The challenge is analyzed in the analytical methods in [17].

The ADM has been extensively applied to fractional differential equations due to its convenience. The Adomian series should be calculated in each iteration which greatly affects the efficiency and accuracy of the analytical approximation. In order to solve this problem, Duan very recently suggested a new way to calculate the Adomian series in [22–25] and successfully extended it to the fractional differential equation [26].

In this paper, we adopt Duan’s way to calculate the Adomian series and apply it to FDEs for . We define the residual function and give the error analysis and investigate the validness of the iteration formulae.

#### 2. Algorithm of the Fractional Differential Equations

*Definition 1 (see [2]). *The Caputo derivative is defined as
where is the Gamma function.

*Definition 2 (see [2]). *The R-L integration of order is defined by

Now we present our analytical schemes using the convenient Adomian series, Laplace transform, and Pade approximation. We adopt the steps in [27, 28]. Considering the following general fractional differential equations (FDEs), where is a linear operator with respect to such as , we show the following iteration schemes.(a)Take Laplace transform to both sides: We can have iteration formula (4) through inverse of Laplace transform : where and can be determined by calculation of Laplace transform to . This step makes (3) in time domain equivalently defined in the Laplace domain. This idea is illustrated in the solution of differential equations [27–29]. Here the similarly plays a role as the Lagrange multipliers in the VIM [29].(b)Through the Picard successive approximation, we can obtain the following iteration formula: (c)Let and apply the Adomian series to expand the term as . Then the iteration formula reads according to [24], where is calculated by (d)The th-order approximation is explicitly given as The depends on the which is denoted as This characteristic allows us to obtain the approximate solutions from and .

#### 3. Numerical Example and Error Analysis

*Example 1. *Consider the following nonlinear FDE:
with the initial conditions

Following to the steps (a) to (d) in Section 2, we can have where can be identified using the Laplace as .

The iteration formula is written as

For , the Adomian series and the approximate solutions can be calculated as

We find the new way to calculate the solution and the series is very convenient compared with the classical one. Set and plot the defined residual function in Figure 1:

From Figure 2, we can conclude that iteration formula (14) and the approximate solutions are correct.

*Example 2. *The second example is given as
We obtain the following formulae based on the Adomian series:
For , we can have the approximate solutions successively as
We plot the in Figure 3.

#### 4. Conclusions

This study applied the convenient Adomian series to fractional differential equations whose order is between one and two. Two nonlinear examples are used to illustrate the basics of the steps. We found the calculation of the solutions is more convenient and more rapid compared with the classical version. The approximate order here can be chosen as while this choice is impossible for the classical definition. This merit is particularly nice for the fractional differential equations and the results show this purpose.

#### Conflict of Interests

The authors declare that there is no conflict of interests regarding the publication of this paper.

#### Acknowledgments

This work was financially supported by the Guangxi Natural Science Foundation (Grant no. 2013GXNSFBA019021), the Scientific Research Foundation of Guangxi University (Grant no. XBZ1205422013), and SWPU Science and Technology Fund (no. 2013XJZ029).

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