﻿ Solution of Nonlinear Integro Differential Equations by Two-Step Adomian Decomposition Method (TSAM)

International Journal of Modern Nonlinear Theory and Application
Vol.05 No.04(2016), Article ID:72790,8 pages
10.4236/ijmnta.2016.54022

Solution of Nonlinear Integro Differential Equations by Two-Step Adomian Decomposition Method (TSAM)

Maryam Al-Mazmumy1, Safa O. Almuhalbedi2

1Department of Mathematics, Faculty of Science-Al Faisaliah Campus, King Abdulaziz University, Jeddah, Saudi Arabia

2Department of Mathematics, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia

Received: November 4, 2016; Accepted: December 13, 2016; Published: December 16, 2016

ABSTRACT

The Adomian decomposition method (ADM) can be used to solve a wide range of problems and usually gets the solution in a series form. In this paper, we propose two-step Adomian Decomposition Method (TSAM) for nonlinear integro-differential equations that will facilitate the calculations. In this modification, compared to the standard Adomian decomposition method, the size of calculations was reduced. This modification also avoids computing Adomian polynomials. Numerical results are given to show the efficiency and performance of this method.

Keywords:

Adomian Decomposition Method, Nonlinear Volterraintegro-Differential Equations, Nonlinear Fredholmintegro-Differential Equations, Two-Step

1. Introduction

In 1999, Wazwaz [1] presented a powerful modification to the “Adomian Decomposition Method” (ADM) that accelerated the rapid convergence of the series solution as compared with the standard Adomian method [2] . The modified technique has been shown to be computationally efficient while applied to several important differential and integral equations in the research. In all cases of applied fields, excellent performance is obtained that may lead to a widespread application in many applied sciences. In addition, the modified technique may give the exact solution for nonlinear equation without any need of the so-called Adomian polynomials [3] .

2. Description of the Method (TSADM)

We consider the Integro-differentil equation of the form

(1)

with initial condotions

Where is the second derivative of the unknown function that

will be determined, are the kernels of the integro differential equations, are an analytic function, a and are the limits of integration may be both constants or mixed. And are linear and nonlinear term, respectively.

Let, so, applying to both sides of (1), and using

initial conditions, we obtain

(2)

For nonlinear equations, the nonlinear operator is usually represented by an infinite series of the Adomian polynomials

(3)

The standard Adomian method defines the solution by the series

(4)

where the components are usually determined recursively by:

(5)

The main ideas of the proposed “Two-Step Adomian Decomposition Method” are:

(1) Applying the inverse operator to, and using the given conditions it is obtained:

(6)

where the function represents the terms arising from using the given conditions. To achieve the objectives of this method, it is set:

(7)

where are the terms arising from integrating f and from using the given conditions. Based on this, the function uo is defined as:

(8)

where, ,. Then, by substitution, verify that satisfies the integro differential equation (1) and the given conditions. Once the exact solution is obtained, the process is ended, otherwise, go to the following step two.

(2) We set and continue with the standard Adomian recursive relation

(9)

Compared to the common “Adomian Decomposition Method” and the “Modified Decomposition Method”, it is clear that the “Two-Step Decomposition Method” may produce the solution by using only one iteration. It is worthy to note that the Procedure of verification in the first step can be larg effective in many cases. This can be note through the following examples. Further, the “Two-Step Decomposition Method” avoids the difficulties arising in the modified method. Also the number of the terms in, namely, is small in many practical problems.

3. Computational Results and Analysis

Example 1

Consider nonlinear Volterraintegro-differential equation [9]

(10)

With the exact solution is. Applying in both sides given,

(11)

The modified decomposition method: Using the modified recursive relation (10), and by selecting we obtain

(12)

In view of (12), the exact solution is given by.

It is to be noted that if we select, the same size of com-

putational work required compared to the standard Adomian method.

The (TSADM), using the scheme (7) gives

(13)

By selecting and by verifying that justifies equation (10) and the given initial condition, the same solution is obtained immediately

However, we use the standard Adomian method to find:

(14)

In view of (14), the modified method also requires a huge size of computational work to obtain few terms of the series. Moreover, the same as the standard Adomian decomposition method, the modified method requires the use of the Adomian polynomials for nonlinear models. However, using the two-step Adomian decomposition method, there is no need to use the Adomian polynomials.

Example 2

Consider nonlinear Fredholmintegro-differential equation

(15)

With the exact solution is.

Applying in both sides given,

(16)

The modified decomposition method: Using the modified recursive relation (15), and by selecting we obtain

(17)

In view of (17), the exact solution is given by.

It is to be noted that if we select, the same size of computational

work required compared to the standard Adomian method.

The (TSADM), using the scheme (7) gives

(18)

By selecting and by verifying that justifies equation (15) and the given initial condition, the same solution is obtained immediately

However, we use the standard Adomian method to find:

(19)

In view of (19), the modified method also requires a huge size of computational work to obtain few terms of the series. Moreover, the same as the standard Adomian decomposition method, the modified method requires the use of the Adomian polynomials for nonlinear models. However, using the two-step Adomian decomposition method, there is no need to use the Adomian polynomials.

Example 3

Consider the system of nonlinear Volterraintegro differential equation [10]

(20)

With the exact solution are.

Applying of both sides gives

(21)

The modified decomposition method: Using the modified recursive relation (20), and by selecting we obtain

(22)

In view of (22), the exact solution is given by

It is to be noted that if we select , the same size of computational work required compared to the standard Adomian method.

The (TSADM), using the scheme (7) gives

(23)

By selecting

(24)

and by verifying that, justifies equation (20) and the given intial conditions, the same solution is obtained immediately.

(25)

However, we use the standard Adomian method to find:

(26)

In view of (26), the modified method also requires a huge size of computational work to obtain few terms of the series. Moreover, the same as the standard Adomian decomposition method, the modified method requires the use of the Adomian polynomials for nonlinear models. However, using the two-step Adomian decomposition method, there is no need to use the Adomian polynomials.

Example 4

Consider the system of nonlinear Fredholmintegro-differential equation [10]

(27)

With exact solution. Applying of both sides gives

(28)

The modified decomposition method: Using the modified recursive relation (27), and by selecting we obtain

(29)

In view of (29), the exact solution is given by

It is to be noted that if we select, the same

size of computational work required compared to the standard Adomian method.

The (TSADM), using the scheme (7) gives

(30)

By selecting

(31)

and by verifying that, justifies equation (27) and the given initial conditions, the same solution is obtained immediately.

(32)

However, we use the standard Adomian method to find:

(33)

In view of (33), the modified method also requires a huge size of computational work to obtain few terms of the series. Moreover, the same as the standard Adomian decomposition method, the modified method requires the use of the Adomian polynomials for nonlinear models. However, using the two-step Adomian decomposition method, there is no need to use the Adomian polynomials.

4. Conclusion

In this paper, we have applied two-step Adomian Decomposition Method (TSAM) to obtain the solutions of nonlinear integro-differential equations. Some examples have been discussed as illustrations. In this work, we show that TSADM is convenient to solve integro-differential equations and reduce the size of calculations compared to the standard Adomian decomposition method and modified decomposition method. This modification also avoids computing Adomian polynomials. The TSADM produce the solution by using only two iterations, if compared with the common Adomian method and the modified method. Moreover, the TSADM overcomes the difficulties arising in the modified decomposition method.

Cite this paper

Al-Mazmumy, M. and Almuhalbedi, S.O. (2016) Solution of Nonlinear Integro Differential Equations by Two-Step Adomian Decomposition Method (TSAM). International Journal of Modern Nonlinear Theory and Application, 5, 248- 255. http://dx.doi.org/10.4236/ijmnta.2016.54022

References

1. 1. Wazwaz, A. (1999) A Reliable Modification of Adomian Decomposition Method. Applied Mathematics and Computation, 102, 77-86.
https://doi.org/10.1016/S0096-3003(98)10024-3

2. 2. Adomian, G. (1994) Solving Frontier Problems of Physics: The Decomposition Method. Kluwer Academic Publisher, Boston.
https://doi.org/10.1007/978-94-015-8289-6

3. 3. Rach, R. (2008) A New Definition of the Adomian Polynomials. Kybernetes, 37, 910-955.
https://doi.org/10.1108/03684920810884342

4. 4. Luo, X.G. (2005) A Two-Step Adomian Decomposition Method. Applied Mathematics and Computation, 170, 570-583.
https://doi.org/10.1016/j.amc.2004.12.010

5. 5. Zhang, B.Q., Wu, Q.B. and Luo, X.G. (2006) Experimentation with Two-Step Adomian Decomposition Method to Solve Evolution Models. Applied Mathematics and Computation, 175, 1495-1502.

6. 6. Khan Marwat, D.N. and Asghar, S. (2008) Solution of the Heat Equation with Variable Properties by Two-Step Adomian Decomposition Method. Mathematical and Computer Modelling, 48, 83-90.
https://doi.org/10.1016/j.mcm.2007.09.003

7. 7. Al-Mazmumy, M. and Al-Malki, H. (2015) Some Modification of Adomian Decomposition Method for Nonlinear Partial Differential Equations. IJRAS, 23.

8. 8. Bakodah, H.O. (2013)Adomian Decomposition Method and Its Modification for Nonlinear Abel’s Integral Equation. International Journal of Mathematical Analysis, 48, 2349-2358.

9. 9. Dehghan, M. and Salehi, R. (2012) The Numerical Solution of the Non-Linear Integro-Differential Equations Based on the Meshless Method. Journal of Computational and Applied Mathematics, 236, 2367-2377.
https://doi.org/10.1016/j.cam.2011.11.022

10. 10. Wazwaz, A.M. (2011) Linear and Nonlinear Integral Equations: Methods and Applications. Springer-Verlag, Beijing.
https://doi.org/10.1007/978-3-642-21449-3