International Journal of
Science and Technology Education Research

  • Abbreviation: Int. J. Sci. Technol. Educ. Res.
  • Language: English
  • ISSN: 2141-6559
  • DOI: 10.5897/IJSTER
  • Start Year: 2010
  • Published Articles: 79

Full Length Research Paper

Single basis function method for solving diffusion convection equations

Sunday Babuba
  • Sunday Babuba
  • Department of Mathematics, Federal University Dutse, Ibrahim Aliyu Bye-Pass, P. M. B. 7156, Dutse, Jigawa State, Nigeria.
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  •  Received: 26 June 2017
  •  Accepted: 24 August 2017
  •  Published: 30 September 2017

 ABSTRACT

In this study, we developed a new numerical finite difference method for solving various diffusion convection equations. The method involves reduction of the diffusion convection equations to a system of algebraic equations. By solving the system of algebraic equations we obtain the problem approximate solutions. The study of the numerical accuracy of the method has shown that the method provides similar results to the known explicit finite difference method for solving diffusion convection equations, but with fewer numbers of iterations.

Key words: Lines, multistep collocation, parabolic, Taylor’s polynomial.


 INTRODUCTION

In this study, we will deal with diffusion convection equations, where and are the time and space coordinates respectively, and the quantities and are the mesh sizes in the space and time directions.
 
We consider,
 
 
A special type of diffusion convection equation where   are constants, defined for and positive time with appropriate initial and boundary conditions, and    is  the  temperature  in  the  medium. We are interested in the development of numerical techniques for solving diffusion convection equations. Recently, there is a growing interest concerning continuous numerical methods of solution for Ordinary Differentials Equations (ODEs) (Adam and David, 2002; Awoyemi, 2002, 2003; Bao et al., 2003; Benner and Mena, 2004; Bensoussan et al., 2007; Motmans et al., 2005; Brown, 1979; Chawla and Katti, 1979; Cook, 1974; Crandall, 1955; Crane and Klopfenstein, 1965; Crank and Nicolson, 1947; Dahlquist and Bjorck, 1974; Dehghan, 2003; Dieci, 1992; Douglas, 1961; D’ Yakonov and Ye, 1963; Eyaya, 2010; Fox, 1962; Penzl, 2000; Pierre, 2008; Richard and Albert, 1981; Richard et al., 2001; Saumaya et al., 2012; Yildiz and Subasi, 2001; Zheyin and Qiang, 2012). We are interested in the  extension  of a  particular continuous method to solve the diffusion convection equation. This is done based on the collocation and interpolation of the Partial Differential Equations (PDEs) directly over multi steps along lines but with reduction to a system of ODEs.


 THE SOLUTION METHOD

 
Writing Equation 4 as matrix in its augmented form, we have
 
 
 
Writing Equation 16 as matrix in augmented form, we have
 


 ADVANTAGE OF THE NEW SCHEME OVER FINITE DIFFERENCE METHOD

The new scheme requires fewer numbers of iterations than the finite difference method to achieve the same results.


 NUMERICAL EXAMPLES

Here, we will test the numerical accuracy of the new method by using the scheme to solve two test examples. We compute an approximate solution of Problems (1) and (2) at each time level (Tables 1 and 2). To achieve this, we truncate the polynomials after second degree.
 


 SPECIFIC PROBLEM

Example 1
 
Here we use  the  scheme to  approximate the solution to the diffusion convection equation (Table 1)
 
 
Example 2
 
Here we use the scheme to approximate the solution to the diffusion convection equation (Table 2)
 


 CONCLUSION

A numerical method which involves the discretization of the diffusion convection equations to a system of algebraic equations is formulated for solving diffusion convection problems. To check the accuracy of the numerical method, it is applied to solve two different test problems with known finite difference solutions. The overall numerical results obtained showed that the values obtained are the same with the results of the finite difference method. These confirmed the validity of the new numerical scheme and suggested that it is an interesting and viable numerical method.


 CONFLICT OF INTERESTS

The author has not declared any conflict of interests.



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