Numerical Solution for Fractional Integro-differential Equations Using Haar Wavelets

A.Padmanabha Reddy1, Manjula S. H2., C. Sateesha3

1,2,3Department of Studies in Mathematics, V. S. K. University, Ballari, Karnataka,India.

Email:[email protected]

Abstract: In this paper, we solved the fractional integro-differential equations using Haar wavelets. Many problems of science and engineering are modeling by the fractional integro-differential equations. For such problems we constructed the algorithm based on Haar wavelets using collocation method. Some test problems are solved and compared results with other numerical methods to show the accuracy and efficiency of the proposed method.

Keywords: Fractional integro-differential equations, Haar wavelets, Collocation method.

1.Introduction

The fractional integro-differential equations arise in many fields of science and engineering viz. thermal systems, turbulence, ?uid ?ow, mechanics, viscoelastic,1 image processing mathematical modeling of heat conduction in materials with memory. However, these equations are found in combined conduction, convection and radiation problems 2 and other areas of applications.

The wavelets have many applications in science and engineering since 1910. Many families of wavelets are exist viz. Haar, Daubechies, Symlet, Coi?et, biorthogonal spline, etc. Alfred Haar3 invented the Haar wavelets, which are yielded from pairs of piecewise constant functions. These functions are orthogonal, symmetric, compactly supported and have explicit expression for each scaling function 4. Due to these properties Haar wavelets is using as a mathematical tool in the numerical solution of many problems. Chen and Hsiao 5,6 have derived the operational matrix method to solve problems of dynamical systems. The method is improved by the Lepik7 through integration of Haar wavelets, where as Haar wavelets with a collocation method is applied to the many problems of higher order ODEs, Integral and integro differential equations by Siraj ul Islam8, Fazal et. al.9,10, Reddy et. al.11,12, Mishra et. al.13 etc. We motivated by these works and constructed the algorithm to solve considered problems using Haar wavelet collocation method.

Fractional integro-differential equations are solved by many researchers with various numerical methods. R.C Mittal et. al.14 have employed the adomian decomposition method, Ordokhani et. al. 15 have applied the Bessel polynomial method(BPM), Mohammed 16 had used the least squares method with the aid of shifted Chebyshev polynomial.

We considered the following types of linear fractional integro-differential equations defined over (0,1)

Fractional Fredholm integro-differential equation

Fractional Volterra integro-differential equation

with

here , is the highest order of derivative of are the given functions, is the unknown function to be determined.

In this paper, section 2 contains the Haar wavelets and their integrals of fractional order, method of solution is shown in section 3, experimental problems are inserted in section 4 and conclusion is given in section 5.

2. Haar wavelets and their integrals of fractional order

Haar functions forms the basis for The Haar function defined in the interval is divided into subintervals of equal length where the maximum level of resolution is. Two more parameters are required i.e. dilatation and translation to construct Haar wavelet 7,12. When ,

Here

For we have father wavelet

For we have father wavelet

We can integrate the Haar functions several times and notations are given by

If is fractional and then using gamma function Eq. (6) is reduced to

and for , we get

If is natural number and , then Eq. (6) is given as

For , Eq. (6) becomes

With the property of Haar multiresolution analysis, any finite energy function defined in the interval i.e.can be decomposed as infinite sum of Haar wavelets

here, are Haar wavelet coefficients. If is piecewise constant or approximated by piecewise constant during each subinterval then infinite series can be terminate as finite series

3.Method of Solution

Haar functions are piecewise constant and discontinuous in the interval So that differentiation of these functions at their point of discontinuity does not exist but we can integrate the functions many times. By this reason we expand highest fractional order derivative in the fractional integro-differential equation into Haar functions, through the integration we get other derivatives.

Express highest order derivative in Eq.(1) or Eq.(2) in terms of Haar functions for given resolution

Substitute Eq. (13) and (14) in Eq. (1) or Eq. (2).

Discritize the obtained equation at collocation points where is the grid point given by we get algebraic system.

Calculate the Haar coefficients and obtain the Haar solution for unknown function

4. Numerical Experiments

We solved the experimental problems of fractional integro-differential equations, whose exact solution is known. We showed the solutions, numerically and graphically using Matlab software.

Example 1: Let us take the linear fractional Fredholm integro-differential equation15:

with initial conditions Exact solution of the problem is We shown the exact and approximate solutions with J=4 in Figure 1. Absolute errors obtained by HWCM for J=1 are compared with the BPM15 in table 1.

Figure1: Approximate and exact solution for Example 1 with J=4.

Table 1: Comparison of absolute errors for Example 1.t HWCM

J=1 BPM15

N=2 BPM15

N=4 BPM15

N=6

0.0 0.00E-00 5.81E-04 2.04E-05 2.51E-06

0.1 0.00E-00 9.12E-06 1.85E-05 6.45E-06

0.2 0.00E-00 5.30E-04 6.49E-05 1.95E-05

0.3 0.00E-00 1.00E-3 1.13E-04 3.28E-05

0.4 0.00E-00 1.50E-03 1.60E-04 4.49E-05

0.5 0.00E-00 2.00E-03 2.03E-04 5.55E-05

0.6 0.00E-00 2.40E-03 2.39E-04 6.46E-05

0.7 5.55E-17 2.70E-03 2.68E-04 7.22E-05

0.8 0.00E-00 3.10E-03 2.91E-04 7.81E-05

0.9 1.11E-16 3.40E-03 3.10E-04 8.23E-05

1.0 2.22E-16 3.70E-03 3.28E-04 8.58E-05

Example 2: We considered the linear fractional Volterra integro-differential equation14 :

with initial condition Exact solution of the problem is Approximate and exact solution with J=3 is shown in Figure 2. Absolute errors obtained for J=3 is inserted in Table 2.

Figure2: Approximate and exact solution for Example 2 with J=3.

Table 2: Absolute errors for Example 2.t HWCM

J=3

0.0 0.00E-00

0.1 1.58E-04

0.2 4.01E-04

0.3 4.86E-05

0.4 1.24E-03

0.5 2.02E-03

0.6 1.39E-03

0.7 1.46E-03

0.8 3.67E-04

0.9 3.07E-03

1.0 5.26E-03

5.ConclusionWe used the Haar wavelet collocation method to solve linear fractional integro-differential equations of Fredholm and Volterra types. Applicability of the method is tested on few examples. We got least absolute errors for small number of collocation points. Comparison of numerical solutions with other method revealed that proposed method has efficiency and accuracy.

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