#### Abstract

In this paper, the complete discrimination system method is used to construct the single traveling wave solutions for the ()-dimensional Jimbo-Miwa equations with space-time fractional derivative. As a result, we get the exact traveling wave solutions of the ()-dimensional Jimbo-Miwa equation with space-time fractional derivative, which include rational function solutions, Jacobian elliptic function solutions, hyperbolic function solutions, and trigonometric function solutions. Some graphical representations of the solutions are also provided. Finally, the obtained solution is compared with the existing literature.

#### 1. Introduction

In recent decades, a large number of nonlinear partial differential equation (NLPDE) have been proposed and studied in order to describe nonlinear wave phenomena in the fields of hydrodynamics, plasma physics, solid physics, and condensed matter physics. Moreover, in order to make these NLPDE better fit the actual situation, many researchers also simulate complex factors by using mathematical tools, such as stochastic differential and fractional differential [1–5]. In the research methods, traveling wave solutions, as a special kind of analytical solutions of NLPDE, plays an important role in understanding nonlinear wave phenomena [6–12]. Therefore, the exact traveling wave solution is an attractive work in the study of theory and practice.

In 1983, Jimbo and Miwa [13] firstly proposed the following nonlinear partial differential equation in the study of Lie algebra: which is called classical ()-dimensional Jimbo-Miwa (JM) equation. JM equation is the second equation of the famous Kadomtsev–Petviashvili (KP) hierarchy of integrated systems. It plays an important role in the study of three-dimensional waves in plasma and optics.

Although JM equation is nonintegrable, it has solitary wave solutions, and the behavior of these solitary waves is different from that of solitons in multiple collisions, which has attracted much attention to its traveling wave solutions. In 2000, the generalized tanh method was used [14] to obtain some traveling wave solitary wave solutions. In 2001, some hyperbolic function solutions and trigonometric function solutions of JM equation were obtained by the homogeneous balance method [15]. In 2007, through the double soliton method and bilinear method, Dai et al. [16] obtained some special traveling wave solutions, including smooth cross kink wave solution, singular periodic kink wave solution, singular periodic soliton wave solution, and singular double periodic wave solution. In 2017, Wazwaz obtained multiple-soliton solutions using the tanh-coth method [17]. In 2010, Song and Ge use expansion method; three new traveling wave solutions were expressed as hyperbolic function, trigonometric function, and rational function in [18]. In 2011, Li et al. [19] applied the generalized three wave method to derive accurate three wave solutions, including periodic cross kink wave solutions, double periodic solitary wave solutions, and solitary wave solutions. In 2016, Ma gets four kinds of block solutions for Hirota bilinear form which are given in [20]. In 2017, Su and Dai [21] gave its single-periodic wave solution and double-periodic wave solution by using the multidimensional elliptic function. It is worth mentioning that with the development of traveling wave solution theory, more and more effective methods are applied to find traveling wave solutions. Very recently, -soliton solutions to integrable equations have systematically been studied by the Hirota direct method, see [22–25].

Due to various real-world applications of fractional differential equations [26–30], we consider the ()-dimensional JM equation with fractional order space-time derivatives in the following form [31]: where , and are denoted the order of fractional derivative.

The fractional Jimbo-Miwa (FJM) equation contains the same property of fractional KP equation and fractional KdV equation. Also, it practically describes the ()-dimensional travelling wave nature [32]. The exact analytical solutions of () space-time FPDEs are very difficult to handle, due to the presence of very complicated nonlinear terms. Because of that, numerous numerical and analytical methods have been suggested for getting solutions to those types of equations. The analytical solutions of conformable time-fractional space-time fractional JM equation have been presented by Korkmaz [32]. In 2017, the exp(-(phi)) method is used to construct the exact solutions of nonlinear space-time fractional ()-dimensional Jimbo-Miwa equation [33]. In 2019, Zhou et al. [34] applied the bifurcation method of dynamical system to investigate the phase space geometry of ()-dimensional JM equation. In 2020, Sahoo and Ray [35] applied extended -expansion method to space-time fractional ()-dimensional JM equation and got antikink wave solutions.

The paper is constituted in six sections as described as the following: the introduction of local fractional calculus and algorithm of the complete discrimination system method have been described in Section 2. We simplify Equation (2) to the nonlinear ordinary differential equation by fractional traveling wave transformation in Section 3. The classification of all single traveling wave solutions has been presented in Section 4. The numerical simulation of results have been presented in Section 5. A precise conclusion of the presented work has been presented in Section 6.

#### 2. Introductions of Local Fractional Calculus and Algorithm of the Proposed Method

##### 2.1. Definition of Local Fractional Derivative

*Definition 1. *Let . Then, the derivative with local fractional-order at for is presented as [36]:
where and

*Remark 2. *The following rule holds:

*Remark 3. *If where then we get
when and exist.

If where , then we get when and exist.

##### 2.2. The Algorithm of the Complete Discriminant System Method

The complete discriminant system method was first introduced by Yang and his team members in 1961. The higher-order polynomial discriminant system established by this method can be used to find the traveling wave solutions of fractional nonlinear fractional partial differential equations. The primary steps are given as follows.

*Step 1. *Here, we have considered a nonlinear fractional differential equation as the following form
where , and are the local fractional derivatives of with respect to , and . is a polynomial of and its various partial derivatives, in which the highest-order derivatives and nonlinear terms are involved.

*Step 2. *The fractional complex transform is presented as (see [10, 11])
where , and are arbitrary constants.

By using the chain rule (see Remark 3), we have:

Here, are the fractal indexes, without loss of generality, , is a constant.

Equation (7) is reduced to the following nonlinear ordinary differential equation (ODE) by using Equation (8):

Without losing generality, Equation (8) can also be written in the following form: where is a polynomial in and its derivatives and notation () are the derivatives with respect to .

*Step 3. *Rewrite Equation (11) into the following form:
where are parameters.

*Step 4. *Integrate both sides of Equation (12) once, we have
where is a polynomial function. In this paper, is a third-degree polynomial in the form
where are constants with respect to the parameters .

According to the complete discrimination system (23) for the third-degree polynomial, the roots of can be classified, and then, the solution of Equation (13) can be obtained. The detailed classification will be given in Section 3.

#### 3. The Fractional Traveling Wave Transformation for Space-Time FJM Equation

This section contains the solution of Equation (2) by using the complete discriminant system method.

By the help of Equation (8), Equation (2) can be reduced to the following third-order nonlinear ODE:

Multiply both sides of (15) by and integrate once, we get where and are integral constants.

Let . Then, Equation (16) can be written as

Take a suitable transform in the following form:

Substituting (18) into Equation (17), we get a nonlinear ODE:

Assume that

Then, we write Equation (19) to the form:

Equation (19) can be changed to the following integral form by using Equation (21): where is an integral constant.

The corresponding complete discrimination system of (19) is

However, in this study, we aim to establish new exact solitary wave solutions to the space-time fractional ()-dimensional JM Equation (2) by complete discriminant system method with the aid of symbolic computation software Maple. A kind of comparison analysis will be provided alongside the results and discussion of the considered problems. Some graphical representations of the problems and that of comparison will be provided at the end.

#### 4. The Classification of All Single Traveling Wave Solutions

*Case 1. *If and , then has a double real root and a single real root. Denote , where .

When , we have

Then, by and (24), the solution of Equation (17) is

We can see that when and , Equation (17) has solitary wave solutions (25) and (26) and has trigonometric function periodic solutions (27).

*Case 2. *If and , then has a triple real root. Denote , we have

Then, the solution of Equation (17) is

Equation (29) shows that the factional JME (17) has rational function solution.

*Case 3. *If and , then has three different real roots, , and . If , taking the transformation , then we obtain
where .

By the definition of Jacobi function and (30), we have

Thus, the solution of Equation (17) is

If take the transformation ; the solution of Equation (17) is where

So, we get two periodic solutions, because sn and cn are biperiodic functions. Note that

If , , then Equation (17) has two solitary wave solutions

*Case 4. *If then has only one real roots. Denote , where

If taking the transformation , then we obtain where .

From the definition of Jacobi function and (36), we have

Then, if , by Equation (37), the solution of Equation (17) is

Since and (8), we get the travelling solutions of Equation (2) from (25), (26), (27), (29), (32), (33), and (38), respectively. where , .

#### 5. Numerical Simulation

According to the above classification of all single travelling wave solutions to space-time fractional JM equation, we give the corresponding representation of these solutions. By taking concrete parameter values and conditions, we give concrete solutions. This means that all these solutions are realizable. The following contains the 3D and 2D solution graph for the obtained solutions of space-time fractional JM equation. Here, the numerical simulation has been done in Figures 1–7 for showing the nature of the obtained solution. In addition, we also note that (25) and (26) are solitary wave solutions, but and are not solitary wave solutions. Similarly, (32), (33), and (38) are the periodic wave solutions, but are the sum of unbounded function and periodic functions. These just illustrate the complexity of JM equation.

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**(b)**when#### 6. Conclusion

The space-time fractional ()-dimensional JM equations is studied by the complete discrimination system method. Compared with the existing literature [33, 35], a series of new exact solutions are obtained, including rational function solutions, Jacobian elliptic function solutions, hyperbolic function solutions, and trigonometric function solutions. It can be seen from the above figures that all solutions can be realized by selecting appropriate parameters, which means that compared with other literatures, we have obtained more abundant traveling wave solutions of ()-dimensional Jimbo-Miwa equation with space-time fractional derivative. These solutions may help us to explore new phenomena which appear in Equation (2). This paper gives a new idea to study the dispersive traveling wave solutions of ()-dimensional Jimbo-Miwa equation with space-time fractional derivative. If , and take 1, we get the traveling wave solutions to the usual JM Equation (1). Moreover, the complete discrimination system method can also be used to find the exact traveling wave solutions of other coupled systems. In future research work, we will focus on the exact traveling wave solution of more complex coupled systems.

#### Data Availability

No data were used to support this study.

#### Conflicts of Interest

The authors declare that they have no conflicts of interest.

#### Acknowledgments

This study was supported by the opening fund of Geomathematics Key Laboratory of Sichuan Province (no. scsxdz2021yb05).