Abstract
Fractal–fractional differential and integral operators have been recognized recently as superior operators as they are able to depict physical problem with both memory effect and self-similar properties. Therefore, differential and integral equations constructed from these new operators are of great importance. In this paper, we extend the method of predictor–corrector to obtain numerical solution of non-linear differential and integral equations. Some examples are presented to illustrate the efficiency of the new method for solving these new equations.
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1 Introduction
Due to the capability of differential and integral operators to model different real world problems, researchers in the past years have devoted their attention in suggesting new differential and integral operators that could possibly be used in terms of modelling more complex real-world problems. In the last decades, quite a few have been suggested, fractional differential and integral operators with power law kernel, which was the first for non-local operators, fractional differential and integral operators with exponential decay law, which was suggested by Caputo and Fabrizio, fractional differential and integral operators with the generalized Mittag-Leffler function, which was suggested by Atangana and Baleanu [1,2,3,4,5,6,7]. For each one of these operators, their associate variable orders have been suggested as they were found suitable for modelling anomalous problems. While these differential and integral operators with their associated variable order have been in great results in the last decades, researchers have found many physical problems that could not be modelled by them. For instance, one can find in nature real-world problems exhibiting either power law and self-similar behavior, or exponential decay with self-similar behavior or even more complicate one, crossover and self-similar behavior [8,9,10,11,12,13,14,15,16,17,18]. None of the above-mentioned differential and integral operators can be used for these purposes. Until very recently, Atangana suggested new differential and integral operators where the differential operator is the convolution of the fractal derivative with fractional kernel, including power law, exponential decay law, and the generalized Mittag-Leffler function. Due to the novelty and their capability of modelling complex real-world problems, new numerical scheme was needed to handle these new equations. New operators called as fractal–fractional differential and integral operators were introduced by Atangana in [19]. This new operators aim to attract more non-local natural problems that display at the same time fractal behaviors. In this paper, the corresponding predictor–corrector will be suggested.
Definition 1
[19] Suppose that \(f\left( t\right)\) be continuous and fractal differentiable on an open interval \(\left( a,b\right)\) with order \(\tau\), then the fractal–fractional derivative of \(f\left( t\right)\) with order \(\alpha\) in the Riemann–Liouville sense having power law type kernel is given by
where \(m-1<\alpha ,\beta \le m\in {\mathbb {N}}\) and
Definition 2
[19] Suppose that \(f\left( t\right)\) be continuous on an open interval \(\left( a,b\right)\), then the fractal–fractional integral of \(f\left( t\right)\) with order \(\alpha\) having power law-type kernel is given by
Definition 3
[19] Suppose that \(f\left( t\right)\) be continuous and fractal differentiable on an open interval \(\left( a,b\right)\) with order \(\beta\), then the fractal–fractional derivative of \(f\left( t\right)\) with order \(\alpha\) in the Riemann–Liouville sense having Mittag-Leffler kernel is given by
where \(\alpha >0,\beta \le m\in {\mathbb {N}}\) and \(AB\left( 0\right) =AB\left( 1\right) =1\).
Definition 4
[19] Suppose that \(f\left( t\right)\) be continuous on an open interval \(\left( a,b\right)\), then the fractal–fractional integral of \(f\left( t\right)\) with order \(\alpha\) having Mittag-Leffler type kernel is given by
Definition 5
[19] Suppose that \(f\left( t\right)\) be continuous and fractal differentiable on an open interval \(\left( a,b\right)\) with order \(\beta\), then the fractal–fractional derivative of \(f\left( t\right)\) with order \(\alpha\) in the Riemann–Liouville sense having exponentially decaying type kernel is given by
where \(\alpha >0,\beta \le m\in {\mathbb {N}}\) and \(M\left( 0\right) =M\left( 1\right) =1\) [19].
Definition 6
[19] The fractional integral associate to the new fractional derivative with exponential decay kernel is defined as
2 New method with Atangana–Baleanu fractal–fractional derivative
Let us consider the following Cauchy problem
where the derivative is Atangana–Baleanu fractal–fractional derivative. Integrating above equation, we obtain the following
We have with the initial condition
At the point \(t_{n+1}=\left( n+1\right) \Delta t\), we have
For the approximation of the function \(f\left( \tau ,y\left( \tau \right) \right)\), we write the Newton polynomial which is given by
Here if we put this polynomial into above equation, we write as follows:
Here
Also we can write
and
We write the first iteration
where
3 New method with Caputo–Fabrizio fractal–fractional derivative
Let us consider the following Cauchy problem:
where the derivative is Atangana–Baleanu fractal–fractional derivative. Integrating above equation, we obtain the following:
with the initial condition. At the point \(t_{n+1}=\left( n+1\right) \Delta t\), we have
At interval \(\left[ t_{k},t_{k+1}\right]\), the function \(f\left( \tau ,y\left( \tau \right) \right)\) is given by
Here if we put this polynomial into above equation, we write such as
Here
Also we can write
where
We write the first iteration:
4 New method with Caputo fractal–fractional derivative
Let us consider the following Cauchy problem
where the derivative is Caputo fractal–fractional derivative. Integrating above equation, we obtain the following:
We have with the initial condition
at the point \(t_{n+1}=\left( n+1\right) \Delta t\) and we can write as follows:
For the approximation of the function \(f\left( \tau ,y\left( \tau \right) \right)\), we write the Newton polynomial which is given by
Here if we put this polynomial into above equation, we write such as
Here
and we write
Here
and
So we write the following:
where
Thus we have the following:
5 Numerical illustrations and simulation
Example 1
We first consider the following problem:
where \({\small \alpha =0.7}\) \({\small \beta =0.4.}\) The exact solution of such equation is
The error of the proposed method is given as
Second, we take as
The error of the proposed method is calculated as
where \({\small \alpha =0.3,\beta =0.45.}\) The exact solution is
Finally, we handle the following problem:
where \({\small \alpha =0.65}\) \({\small \beta =0.25.}\) The exact solution is
The error of the proposed method is as follows:
The numerical simulations are depicted in Figs. 1, 2, 3.
Example 2
We consider the following problem:
where \(\alpha =0.5,\beta =0.7\). The exact solution is
The error norm is calculated as
We handle
where \(\alpha =0.5,\beta =0.7\). The exact solution of such equation is as follows:
The error norm is given by
We solve
where \(\alpha =0.55,\beta =0.7\). The exact solution is
The error norm is calculated as
The numerical simulations are depicted in Figs. 4, 5, 6.
Example 3
We next consider the Coullet system:
with the initial conditions
The numerical simulation is depicted in Fig. 7 for \(\alpha =0.96,\beta =0.98\).
Example 4
We next consider the Shimizu–Morioka system
with the initial conditions
The numerical simulation is depicted in Fig. 8 for \(\alpha =0.98,\beta =0.75\).
Example 5
We next consider the following chaotic problem:
with the initial conditions
The numerical simulation is depicted in Fig. 9 for \(\alpha =0.96,\beta =0.8\).
6 Conclusion
In the last past years, new differential and integral operators were introduced with the aim to capture more complex problems arising in many fields of science,technology, and engineering. Most have been applied with great success, nevertheless, none was able to depict at the same time problems displaying memory and self-similarities. Then, new differential and integral operators called fractal–fractional were introduced and are able to capture both scenarios. Due to the capabilities of these new operators to modeling complex real world problems, new numerical or adapted numerical schemes were needed. In this paper, we adapted the methodology used to derive the method of predictor–corrector which is efficient in solving the associated differential and integral equations.
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Mekkaoui, T., Atangana, A. & Araz, S.İ. Predictor–corrector for non-linear differential and integral equation with fractal–fractional operators. Engineering with Computers 37, 2359–2368 (2021). https://doi.org/10.1007/s00366-020-00948-6
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DOI: https://doi.org/10.1007/s00366-020-00948-6