Abstract
Purpose
Fractional order nonlinear evolution equations (FNLEEs) pertaining to conformable fractional derivative are considered to be revealed for well-furnished analytic solutions due to their importance in the nature of real world. In this article, the autors suggest a productive technique, called the rational fractional
Design/methodology/approach
The rational fractional
Findings
Achieved fresh and further abundant closed form traveling wave solutions to analyze the inner mechanisms of complex phenomenon in nature world which will bear a significant role in the of research and will be recorded in the literature.
Originality/value
The rational fractional
Keywords
Citation
Islam, T. and Akter, A. (2021), "Further fresh and general traveling wave solutions to some fractional order nonlinear evolution equations in mathematical physics", Arab Journal of Mathematical Sciences, Vol. 27 No. 2, pp. 151-170. https://doi.org/10.1108/AJMS-09-2020-0078
Publisher
:Emerald Publishing Limited
Copyright © 2020, Tarikul Islam and Armina Akter
License
Published in Arab Journal of Mathematical Sciences. Published by Emerald Publishing Limited. This article is published under the Creative Commons Attribution (CC BY 4.0) licence. Anyone may reproduce, distribute, translate and create derivative works of this article (for both commercial and non-commercial purposes), subject to full attribution to the original publication and authors. The full terms of this licence may be seen at http://creativecommons.org/licences/by/4.0/legalcode
1. Introduction
Fractional calculus originating from some speculations of Leibniz and L'Hospital in 1695 has gradually gained profound attention of many researchers for its extensive appearance in various fields of real world. Exact traveling wave solutions to fractional order nonlinear evolution equations (FNLEEs) are of fundamental and important in applied science because of their wide use to depict the nonlinear fractional phenomena and dynamical processes of nature world. The FNLEEs and their solutions in closed form play fundamental role in describing, modeling and predicting the underlying mechanisms related to the biology, bio-genetics, physics, solid state physics, condensed matter physics, plasma physics, optical fibers, meteorology, oceanic phenomena, chemistry, chemical kinematics, electromagnetic, electrical circuits, quantum mechanics, polymeric materials, neutron point kinetic model, control and vibration, image and signal processing, system identifications, the finance, acoustics and fluid dynamics [1–3]. The closed form wave solutions of these equations [4–6] are greatly helpful to realize the mechanisms of the complicated nonlinear physical phenomena as well as their further applications in practical life. Some attractive powerful approaches take into account in the recent research area related to fractional derivative associated problems [7–9]. Therefore, it has become the core aim in the research area of fractional related problems that how to develop a stable approach for investigating the solutions to FNLEEs in analytical or numerical form. Many researchers have offered different approaches to construct analytic and numerical solutions to FNLEEs as well as integer order and put them forward for searching traveling wave solutions, such as the He-Laplace method [10], the exponential decay law [11], the reproducing kernel method [12], the Jacobi elliptic function method [13], the
In this study, we offer a newly established technique, called the rational fractional
2. Preliminaries and methodology
2.1 Conformable fractional derivative
A new and simple definition of derivative for fractional order introduced by Khalil et al. [43] is called conformable fractional derivative. This definition is analogous to the ordinary derivative
If the function
This integral represents usual Riemann improper integral.
The conformable fractional derivative satisfies the following useful properties [43]:
If the functions
, where is any constant.if
is differentiable, then .
Many researchers used this new derivative of fractional order in physical applications due to its convenience, simplicity and usefulness [44–46].
2.2 Methodology
In this subsection, we discuss the main steps of the rational fractional
method to examine exact traveling wave solutions to FNLEEs. A fractional partial differential equation in the independent variables
Let us consider the nonlinear fractional composite transformation
We might take anti-derivative of Eqn (2.2.3) term by term as many times as possible and integral constant can be set to zero as soliton solutions are sought.
Step 1: Suppose the traveling wave solution of Eqn (2.2.1) can be expressed as follows:
The nonlinear fractional complex transformation
Step 2: The positive constant
can be determined by taking homogenous balance between the highest order linear and nonlinear terms appearing in Eqn (2.2.3).Step 3: Substitute (2.2.4) and (2.2.5) into Eqn (2.2.3) with the value of
obtained in step 2, we obtain a polynomial in . Setting each coefficient of the resulted polynomial to zero gives a set of algebraic equations for and by means of the symbolic computation software, such as Maple, provides the values of constants.Step 4: Inserting the values of
and into (2.2.4) along with (2.2.7)–(2.2.9), the closed form traveling wave solutions to the nonlinear evolution Eqn (2.2.1) are obtained.
3. Formulation of the solutions
In this section, the exact analytic traveling wave solutions to the nonlinear space-time fractional potential Kadomtsev–Petviashvili (PKP) equation, the nonlinear space-time fractional Sharma–Tasso–Olver (STO) equation and the nonlinear space-time fractional Kolmogorov–Petrovskii–Piskunov (KPP) equation are constructed.
3.1 The nonlinear space-time fractional PKP equation
This well-known equation is given as
With the aid of the fractional compound transformation
Eqn (3.1.1) is turned into the following ordinary differential equations of fractional order due to the variable
Taking anti-derivative of (3.1.3) yields
Considering the homogenous balance to Eqn (3.1.4), the solution (2.2.4) becomes
Eqn (3.1.4) together with (3.1.5) and (2.2.5) becomes a polynomial in
Insert the values appeared in (3.1.6) and (3.1.7) in the solution (3.1.5) provide the following expressions for exact analytic solutions:
The expressions (3.1.8) and (3.1.9) along with (2.2.7)–(2.2.9) make available the following closed form traveling wave solutions in terms of hyperbolic function, trigonometric function and rational function:
3.1.1 Solution 1
When
Choose
When
The choice of
When
Choosing
3.1.2 Solution 2
When
Assigning
When
Conveying
When
The transmission
3.2 The nonlinear space-time fractional STO equation
Consider the nonlinear space-time fractional STO equation
Using the complex fractional transformation
Eqn (3.2.1) reduces to the following fractional order ordinary differential equation with respect to the variable
Taking anti-derivative of Eqn (3.2.3) yields
Applying the homogeneous balance method to Eqn (3.2.4) the solution (2.2.4) takes the form (3.1.5).
Eqn (3.2.4) under the use of solution (3.1.5) and Eqn (2.2.5) creates a polynomial in
Utilizing the values available in (3.2.5) and (3.2.6) in (3.1.5) provide the following expressions for analytic solutions:
The expressions (3.2.7) and (3.2.8) along with (2.2.7)–(2.2.9) make available the following closed form traveling wave solutions in terms of hyperbolic function, trigonometric function and rational function:
3.2.1 Solution 1
When
Fixing
When
Setting up
When
Putting
3.2.2 Solution 2
When
Selecting
When
Assigning
When
Using
3.3 The nonlinear space-time fractional KPP equation
The nonlinear space-time fractional KPP equation is
The fractional complex transformation
reduces Eqn (3.3.1) to
Applying the homogeneous balance method to Eqn (3.3.3) the solution (2.2.4) takes the form (3.1.5).
Using Eqn (3.1.5) and Eqn (2.2.5), Eqn (3.3.3) forms a polynomial in
Inserting the values from (3.3.4) in (3.1.5) provides the following expressions for exact wave analytic solutions:
Eqn (3.3.5) together with (2.2.7)–(2.2.9) presents the following exact traveling wave solutions:
When
Applying
When
Using
When
Fixing
4. Graphical representations
Some of the furnished solutions in this paper are depicted graphically for their physical appearance which stands for different shapes of soliton, like, kink-type soliton, singular kink-type soliton, periodic soliton, singular periodic soliton etc. The solution (3.1.11) represents the shape of kink-type soliton for
The physical appearance of solutions to FNLEEs bears great importance to depict different phenomena arisen in various fields of nature in real world. This paper consists of some fresh and general solutions among which few are graphically brought up.
5. Conclusion
The core aim of this study is to make available further general and fresh closed form analytic wave solutions to the nonlinear space-time fractional PKP equation, the nonlinear space-time fractional STO equation and the nonlinear space-time fractional KPP equation through the suggested rational fractional
Figures

Figure 1
Kink-type soliton of solution (3.1.11) for

Figure 2
Shape of solution (3.1.15) for

Figure 3
Periodic plot of solution (3.1.19) for
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