 Research
 Open Access
 Published:
Modified homotopy perturbation method and its application to analytical solitons of fractionalorder Korteweg–de Vries equation
BeniSuef University Journal of Basic and Applied Sciences volume 11, Article number: 139 (2022)
Abstract
Background
Experimentally brought to light by Russell and hypothetically explained by Korteweg–de Vries, the KDV equation has drawn the attention of several mathematicians and physicists because of its extreme substantial structure in describing nonlinear evolution equations governing the propagation of weakly dispersive and nonlinear waves. Due to the prevalent nature and application of solitary waves in nonlinear dynamics, we discuss the soliton solution and application of the fractionalorder Korteweg–de Vries (KDV) equation using a new analytical approach named the “Modified initial guess homotopy perturbation.”
Results
We established the proposed technique by coupling a power series function of arbitrary order with the renown homotopy perturbation method. The convergence of the method is proved using the Banach fixed point theorem. The methodology was demonstrated with a generalized KDV equation, and we applied it to solve linear and nonlinear fractionalorder Korteweg–de Vries equations, which are in Caputo sense. The method’s applicability and effectiveness were established as a feasible series of arbitrary orders that accelerate quickly to the exact solution at an integer order and are obtained as solutions. Numerical simulations were conducted to investigate the effect of Caputo fractionalorder derivatives in the dispersion and propagation of water waves by varying the order \(\alpha\) on the \([0,1]\) interval. Comparative analysis of the simulation results, which were presented graphically and discussed, reveals that the degree of freedom of the Caputo fractionalorder derivative is vital to controlling the magnitude of environmental hazards associated with water waves when adjusted.
Conclusion
The proposed method is recommended for obtaining convergent series solutions to fractionalorder partial differential equations. We suggested that applied mathematicians and physicists investigate this work to better understand the impact of the degree of freedom posed by Caputo fractionalorder derivatives in wave dispersion and propagation, as physical applications can help divert waverelated environmental hazards.
1 Background
When waves advance into the region of shallow water, they tend to be affected by the ocean bottom. This leads to the disruption of free water in orbital motion, and the water molecules in the orbital motion can no longer return to their initial position. In turn, environmental hazards such as coastal erosion and the tsunami wave described in [19] are caused by this phenomenon, which often leads to loss of land and damage to the properties of people living in coastal regions [43]. Sailors do simulate the consequences of shallow water waves as it increases the realism of the virtual ocean scene and also supplies accurate parameters to the ship maneuvering model [3]. The intensity of a water wave can be measured by its dispersion. This dispersion is either caused by the interaction of the wave with the transmitting medium or by the geometry and physical constraints [32]. Different mathematical models have been developed to study the impact, significance, and ways of controlling water waves. Among these models are the Boussinesq wave model and the shallow water wave model in [37] and [41], respectively.
Of interest is the dispersive partial differential equation named the Korteweg–de Vries (KDV) equation [26]. It governs weakly and nonlinearly interacting radio waves above 1 km in wavelength with a frequency of 300 kHz traveling in canals of shallow water [28]. The general form of this equation can be found in [8, 31]. The homogenous Korteweg–de Vries equation [7, 36], which described the mathematical model of solitary water waves in a shallow water domain, was coined by Kruskal and Zabusky [2, 9, 17]. Unlike the shallow water equation (which does not take into account the frequency of wave dispersion) and the Boussinesq wave equation (where the use of wave reflections is limited), the Korteweg–de Vries equation can be applied to waves propagating in a single direction that have both frequency and amplitude of dispersion. A recent study in [14] discussed the behavior of different types of traveling waves in the solution of relativistic wave equations associated with the notable Schrödinger equation.
Although the analytic solution of this problem is often not feasible to obtain, an analytic study on the solution of a thirdorder dispersive partial differential equation was conducted in [13]. The Laplace–Adomian decomposition method (LADM) was applied in [27] to obtain the analytical solutions of thirdorder dispersive fractional partial differential equations. The fractional derivatives are in Caputo sense, and the approximate solution obtained converges directly to the exact solutions. Some semianalytic techniques have also been employed to solve this wellknown equation, one of which is in [39], where the Laplace–Adomian decomposition method (LADM), differential transform method (DTM), homotopy perturbation method (HPM), and homotopy perturbation transform method (HPTM) were applied to obtain the solution of linearized dispersive KDV equations. Other numerical techniques, such as the variational iteration method (VIM) proposed by [33], were applied in [6] to solve the higherorder nonlinear KDV equation, and its modification was applied in [7] to obtain the analytical solution of this equation.
Lately, fractional calculus has been an area of interest for modern researchers. This is due to the higher degree of freedom and more realistic behavior exhibited by physical problems governed by it. There exists a diverse set of fractional operators; these consist of the Riemann–Liouville [44], Caputo [11], Caputo–Fabrizio [42], and Antagana–Baleanu [12] operators. These operators are often used as generalized tools for investigating diverse phenomena with a nonlocal kernel, such as fractal and chaotic phenomena with longrange memory. The strength and limitations of these concepts can be found in [44]. Several authors have proposed potent mathematical models capable of simulating chaotic and fractal systems. An example is a study presented in [29] where the numerical solutions and synchronization of a variableorder fractional chaotic system were conducted. A research study on the robust study of listeriosis disease was carried out in [38]. Their study implemented the use of fractal fractional operators to conduct their analysis. Their results show that these operators are productive for the purpose of their study.
Water waves are one of the many nonlocalized physical phenomena described by natural processes found around us. The sequencing pattern of the motion caused by water waves is often associated with fractals [16]. Research presented in [25] shows that modeling of these patterns cannot be carried out with ordinary classical derivatives that are localized. They claimed that the longestablished differentiation technique (integerorder derivatives) is local and that using it to describe physical phenomena with unbounded disparities would be inappropriate because the impact of a larger neighborhood could not be ignored. They discussed that a fractional derivative is a global operator, whose properties thrive on examining the impacts of a larger neighborhood ignored by the local operator as it creates the likelihood of several possibilities for backward and forward motion of waves. They concluded that a nonlocalized derivative such as the Caputo fractionalorder derivative should be employed in the modeling of water waves. The properties and application of these nonlocalized derivatives were applied in [15], where hybrid Caputo fractional modeling for thermostats with hybrid boundary value conditions was carried out. Investigation of a new version of HIV mathematical model using a new approach to fractional derivatives (Caputo–Fabrizio) was applied in [45]. This Caputo–Fabrizio fractional derivative was also applied in [1] to a mathematical theoretical study for the Rubella disease model, as they stated that fractional derivatives, such as Caputo and Riemann derivatives, have their own limitations because their kernel is singular and they cannot be applied to describe the memory effect of the physical system applicable to their problem.
To obtain the solutions of the fractionalorder Korteweg–de Vries equation, researchers in [18] successfully applied the fractional differential transform method (FDTM) and modified differential transform method (MDTM) to obtain the solution of the thirdorder dispersive partial differential equation. In [20], the Laplace–Adomian decomposition method was applied to obtain the solution of the fractionalorder model of measles, and in [21], this same method was applied to obtain the numerical solution of the fractionalorder smoking model.
In this paper, an initial guess technique applied in [4, 5, 40] is modified to be of arbitrary order in a Caputo sense. We coupled it with the homotopy perturbation method introduced in [22, 23, 34, 35] to suit the computation of an approximate solution of the fractionalorder Korteweg–de Vries equation of the form:
subject to the initial condition:
\(u(x,t)\) is a function of real variables which denotes the wave elongation at space \(x\) and time \(t,\) respectively. \(u(x,t)u_{x} (x,t)\) is the nonlinear term, \(u_{xxx} (x,t)\) represents the direction of the wave dispersion, and \(\xi ,\gamma\) are arbitrary constants put in place to obtain a uniformly propagating wave solution.
2 Methods
2.1 Preliminaries
Here, we state some fundamental properties of fractional calculus applicable in this paper.
Definition 1
A real function \(\phi (t),\,\,t > 0,\,\,\) is said to be in the space \(C_{\mu \,} ,\,\,\mu \in R\,\) if there exist a real number \(m > \mu\) such that \(\phi (t) = t^{m} \phi_{1} (t).\,\) where \(\phi_{1} (t) \in C(0,\infty ),\) and it is said to be in the space \(C^{n}_{\mu \,}\) if and only if \(\phi^{(n)} \in C_{\mu } ,\,n \in N.\)
Definition 2
The Riemann–Liouville fractional integration of order \(\eta \ge 0\) for a real positive function \(\phi (t) \in C_{\mu \,} ,\,\,\mu \ge  1\,\,\,t > 0\) is defined as:
The following properties hold for fractional integral operator \(I^{\eta }\) for \(\phi (t) \in C_{\mu \,} ,\,\,\mu \ge  1\,\,\,\eta ,\alpha \ge 0\,\) and \(\,\beta \ge  1\):

1.
\(I^{\eta } I^{\alpha } \phi (t) = I^{\eta + \alpha } \phi (t),\)

2.
\(I^{\eta } I^{\alpha } \phi (t) = I^{\alpha } I^{\beta } \phi (t),\)

3.
\(I^{\eta } t^{\beta } = \frac{\Gamma (\beta + 1)}{{\Gamma (\eta + \beta + 1)}}t^{\eta + \beta } .\)
Definition 3
The Caputo fractional derivative of a positive real function \(\phi (t) \in C_{\mu }\) is mathematically expressed as
The fractional integration of Caputo derivative for \(n  1 < \eta \le n,\,\,n \in N,\,\,\phi \in \mathop c\nolimits_{  1}^{n} ,\,\mu \ge  1\) is:
2.2 Homotopy perturbation method
The fundamental scheme of He’s homotopy perturbation method can be illustrated by considering the general nonlinear differential equation of the form:
subject to the boundary condition:
The general differential operator is denoted by \(D\) and the boundary operator by \(\beta\). \(f(\omega )\) is an analytic function, and \(\Gamma\) is the boundary operator in the domain \(\Omega\). The operator \(D\) is separable into two parts:
The functions \(\ell \,and\,\,\eta\) represent the linear and nonlinear operator, respectively. Substituting Eq. (5) into Eq. (3) yields
A homotopy can be constructed for Eq. (6):
simplifying Eq. (7) yields
where \(p\) is an embedded parameter which undergoes deformation process of changing from 0 to 1: When \(p = 0,\)
and at \(p = 1,\)
A power series solution can be assumed for Eqs. (9) and (10):
and the approximate solution of Eq. (3) is:
The convergence of this series has been proven in [34]. Substituting Eq. (11) into Eq. (8) and equating coefficients of equal powers of p,
The approximate result of each iteration is obtained by solving Eq. (13).
2.3 Modified initial guess homotopy perturbation method (MIGHPM)
In view of the proposed modified initial guess homotopy perturbation method, a power series correctional functional of arbitrary order can be constructed for Eq. (1):
Substituting the initial condition \(u(x,0) = \phi (x)\) into Eq. (14),
From Eq. (15), \(\lambda_{1} t^{\alpha } = u_{1} (x,t),\,\,\lambda_{2} t^{2\alpha } = u_{2} (x,t),\) and so on.
As an assumed solution of Eq. (1), Eq. (15) must satisfy Eq. (1) with unique values of \(\lambda_{1} ,\,\,\lambda_{2} ,\,\lambda_{3} , \cdots \lambda_{n} .\) Thus to evaluate these values, the following derivatives are obtained:
such that evaluation of Eq. (1) using Eq. (16) yields:
At \(t = 0\), Eq. (17) becomes,
And solving for \(\lambda_{1}\) yields:
Since \(u_{1} (x,t) = \lambda_{1} t^{\alpha }\), the first approximation is:
Subsequent approximations can be obtained by constructing a homotopy for Eq. (1):
Simplifying Eq. (21) yields:
Substituting Eq. (11) into Eq. (22) and equating coefficients of equal powers of \(p^{n} ,\,\,n \ge 2\),
The coefficient of \(p^{2}\) is evaluated using Eq. (20), and the Riemann–Liouville fractional integral operator \(I^{\alpha }\) is applied to obtain the second approximation \(u_{2} (x,t)\). Subsequent approximations \(u_{3} (x,t),u_{4} (x,t), \ldots\) are likewise computed.
Theorem 1
Let there be a contractive nonlinear mapping \(\tau :\aleph \to Y\) defined on two Banach spaces \(\aleph\), \(Y\;\forall \;m,n \in \aleph\) then \(\left\ {\tau (m)  \tau (n)} \right\_{Y} \le \varepsilon \left\ {m  n} \right\_{\aleph }\), \(0 < \varepsilon < 1\) such that the sequence \(m_{s + 1} = \tau^{n} (m_{0} ) = \tau (m_{0} )\) for some \(m_{0} \in \aleph\) which converges to a unique fixed point \(\tau\) [30].
Proof
Consider the Picard sequence \(m_{s + 1} = \tau (m_{s} ) \subseteq Y\) we want to show that \(m_{s}\) is convergent in \(Y\) for all \(r \ge s\) \(\left\ {m_{s}  m_{r} } \right\ \le \left\ {m_{s}  m_{s + 1} } \right\ + \left\ {m_{s + 1}  m_{s + 2} } \right\ + \left\ {m_{s + 2}  m_{s + 3} } \right\ + \cdots + \left\ {m_{s  1}  m_{r} } \right\\).
We define the proof by applying mathematical induction on the contractive property of (C):
\(\left\ {m_{s}  m_{s + 1} } \right\ \le \varepsilon^{s} \left\ {m_{0}  m_{1} } \right\\). By implication, \(\mathop {\lim }\limits_{r \to \infty } \left\ {m_{s}  m_{r} } \right\ \le \frac{{\varepsilon^{s} }}{1 + \varepsilon }\left\ {m_{0}  m_{1} } \right\ = 0\,\,as\,\,s \to \infty\).
This proves that \((m_{s} )\) is convergent in \(Y\) and through completeness of \(Y\), we can find \(\omega \in Y\): \(\mathop {\lim }\limits_{s \to \infty } (m_{s} ) = \omega \in Y\). Clearly, the continuity of \(\tau\) is ensured by the contraction (C). Thus, \(\omega = \mathop {\lim }\limits_{s \to \infty } m_{s + 1} = m_{r}\).
3 Application and results
3.1 Example 1
Consider the dispersive KDV equation
subject to the initial condition:
By modified initial guess homotopy perturbation method,
Equation (24) is evaluated using the following derivatives in Eq. (27)
such that at \(t = 0,\)
Therefore,
Constructing a homotopy for Eq. (24),
simplifying Eq. (30),
We can assume a series solution of the form:
Substituting Eq. (32) into Eq. (31) and equating coefficients of equal powers of \(p^{n} ,\,\,n \ge 2\);
Evaluating Eq. (33) using \(\mu_{0} (x,t)\,\,\& \mu_{1} (x,t)\),
Applying operator \(I^{\alpha }\) to both sides of Eq. (35),
Repeating the iterative process,
and so on. The subsequent terms can be evaluated using MATHEMATICA 12 software package.
The approximate solution of Eq. (24) is therefore obtained as:
When \(\alpha = 1\),
And the closed form of the solution is
3.2 Convergence of Solution
Following the theorem of nonlinear mapping \(X\), the convergence of modified initial guess homotopy perturbation method strictly relies on contraction \(X\).
Thus, \(\left\ {\mu_{0}  \mu_{e} } \right\ = \left\ {\frac{x  2}{{12}}  \frac{x  2}{{12  6t}}} \right\ = \frac{1}{12}\left\ {\frac{(x  2)t}{{(t  2)}}} \right\\). For \(\frac{1}{2} < \kappa ,\,0 < \kappa < 1,\)
Clearly,\(\mathop {\lim }\limits_{n \to \infty } \kappa^{n} = 0\); therefore, \(\mathop {\lim }\limits_{n \to \infty } \left\ {\mu_{n}  \mu_{e} } \right\ \le \kappa^{n} \left\ {\mu_{0}  \mu_{e} } \right\ = 0\,\). Thus, modified initial guess homotopy perturbation method agrees that \(\mu_{e} = \mathop {\lim }\limits_{n \to \infty } \mu_{n} (x,t) = \frac{x  2}{{12  6t}}\) which is the exact solution of the problem.
3.3 Problem 2
Consider the following linear homogenous KDV equation
subject to the condition:
By modified initial guess homotopy perturbation method, we can construct
substituting Eq. (41) into Eq. (42),
Equation (40) is evaluated using the following derivatives in Eq. (44),
such that
Solving for \(\lambda_{1}\) in Eq. (45),
Since \(\mu_{1} (x,t) = \lambda_{1} t^{\alpha }\), therefore
To obtain further approximations, we construct a homotopy for Eq. (40):
simplifying Eq. (48),
We assume a series solution of the form:
Substituting Eq. (50) into Eq. (49) and comparing coefficients of equal powers of \(p^{n} ,\,\,n \ge 2\),
Evaluating Eq. (51) using \(\mu_{0} (x,t)\,\,\& \mu_{1} (x,t)\) and applying \(I^{\alpha }\) to both sides,
and
such that
Evaluating Eq. (53) using \(\mu_{0} (x,t)\,\,,\mu_{1} (x,t)\,\& \mu_{2} (x,t)\) yields
applying operator \(I^{\alpha }\),
Subsequently the proceeding iterations are:
And the approximate result is
such that
When \(\alpha = 1\),
The modified method agrees that
By convergence, the exact solution is
In closed form (Fig. 2, Table 2),
3.4 Problem 3
Consider the following nonlinear homogenous KDV equation
subject to the initial condition
By modified initial guess homotopy perturbation method,
Evaluating Eq. (65) using Eq. (68),
Thus,
Constructing a homotopy for Eq. (65),
Simplifying Eq. (72),
Substituting Eq. (50) into Eq. (73) and comparing coefficients of equal powers of \(p^{n} ,\,\,n \ge 2\).
Evaluating Eq. (74) using \(\mu_{0} (x,t)\,\& \,\mu_{1} (x,t)\),
Applying operator \(I^{\alpha }\) to Eq. (76),
Subsequently,
and so on. The approximate solution is:
When \(\alpha = 1\), the integer solution is:
The modified method agrees that
therefore, the closed form of Eq. (64) is obtained as:
which is the exact solution.
3.5 Application to oceanography
The mathematical model of shallow water waves in dimensional form described in [24] to clarify the disturbance caused by waves in the ocean bottom is:
They applied the transformation \(R(\theta ,\varphi ) =  \frac{{\sqrt {16g} h^{\frac{7}{6}} }}{{\sqrt[3]{6}}}\mu (x,t)\) to reduce Eq. (82) to canonical KDV equation presented as:
Let the initial condition be:
Then, Eq. (83) becomes a particular case of Eq. (65) when \(\xi =  6\),
such that
and
3.6 Numerical simulation
Here, we conduct a numerical simulation of the disturbance caused by water waves in the domain of shallow water described by \(R(x,t) = \left\{ {(x,t)\left {  0.05 \le x \le 0.05} \right.,\,\,\,0 < t < 0.42} \right\}\). Equation (86) is substituted into the transformation \(R(\theta ,\varphi ) =  \frac{{\sqrt {16g} h^{\frac{7}{6}} }}{{\sqrt[3]{6}}}\mu (x,t)\) to obtain the theoretical solution of Eq. (82).
Also, Eq. (85) is substituted into \(R(\theta ,\varphi )\) such that the following numerical solution is obtained (Fig. 3, Table 3)
3.7 Theoretical perspective
Physical problems are well modeled with the aid of the Caputo derivative concept. This study reveals that its differentials are powerful tools for modeling linear and nonlinear systems where the order affects the output of functional parameters they contain. The impact of wave interference on nature is determined by the amount of wave crest that forms, which is referred to as “Frequency.” The analysis conducted with the aid of the Caputo derivative employed in this research reveals that the crests formed by water waves are always maximum at an integerorder derivative. This integer order represents a situation in which a water wave is directly propagating in a region with no feasible obstructions. This direct propagation can result in ocean floor landslides and the redistribution of sand and sediment in coastal areas. This can potentially lead to environmental hazards such as flooding and erosion, and the end results are often the loss of life and damage to the properties of people living in coastal regions. To avoid windgenerated waves, direct propagation of winds into the water should be kept to a minimum, which can be accomplished by embracing environmental aiding techniques such as tree planting (which acts as a windbreaker). Other options for controlling water waves include the construction of groins along the shoreline, jetties along coastal lines, and breakwater barriers along the shoreline.
4 Discussion
Unlike previous numerical methods, which required several iterations and tedious computational work to achieve convergence, the proposed method is effective and faster and requires less computation time to obtain the approximate solitons of the fractionalorder KDV equation. In a similar but different study presented in [14], the effectiveness of Caputo differentials was seen. It was applied as one of their operators to provide a computational approach for solving shallow water KDV equations. They achieved this by blending the Caputo derivative with a numerical technique that combines the qhomotopy analysis transform technique and the Laplace transform method, although the objectives of their research extend to hiring two other fractional derivatives named “Caputo–Fabrizio” and “Atangana–Baleanu” to show their impact in generalizing mathematical models associated with power law, nonlocality, singularity, and nonsingularity kernels. In this study, this same Caputo operator proved that it cannot be overridden when it comes to modeling nonlocalized phenomena. It shares an accurate insight into wave properties and behavior through numerical simulation. A major limitation of computing fractionalorder derivatives is its restriction to a few symbolic software packages such as the Mathematica software package; hence, it is recommended that laptops with the minimum specifications: Disk Space: 19 GB; System Memory (RAM): 4 GB+, are applied to ensure high computation speed [10].
5 Conclusion
In this research, we proposed an analytical way of solving the fractionalorder Korteweg–de Vries equation. The method was derived by coupling an initial guess technique with He’s homotopy perturbation method. The new method was applied to different KDV equations with Caputo fractional derivatives. The approximate solution obtained gives a series solution in fractional order, which accelerates rapidly to the exact solution at an integer order. A conceptual study of the fractionalorder derivative in wave dispersion was carried out by simulating the approximate traveling wave solution and investigating the disturbance caused by waves in the shallow water domain using the MAPLE 18 software. The outcome, which was extensively discussed, reveals the significant impact of Caputo’s fractionalorder derivative in wave dispersion and propagation, and it also gives insight on ways of controlling waveassociated hazards.
Availability of data and materials
Not applicable.
Abbreviations
 KDV:

Korteweg–de Vries
 MIGHPM:

Modified initial guess homotopy perturbation method
 LADM:

Laplace–Adomian decomposition
 HPM:

Homotopy perturbation method
 DTM:

Differential transform method
 FDTM:

Fractional differential transform method
 MDTM:

Modified differential transform method
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AII contributed to method development; MOO was involved in problems formulation; KAA contributed to computation; JAA was involved in results simulation; and AOO contributed to typesetting and proof reading. All authors read have read and approved the manuscript.
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Alaje, A.I., Olayiwola, M.O., Adedokun, K.A. et al. Modified homotopy perturbation method and its application to analytical solitons of fractionalorder Korteweg–de Vries equation. BeniSuef Univ J Basic Appl Sci 11, 139 (2022). https://doi.org/10.1186/s4308802200317w
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DOI: https://doi.org/10.1186/s4308802200317w
Keywords
 Korteweg–de Vries
 Modified homotopy perturbation method
 Caputo derivative
 Wave propagation