Research Article | Open Access
Hongcai Ma, Caoyin Zhang, Aiping Deng, "Breather Wave Solutions and Interaction Solutions for Two Mixed Calogero-Bogoyavlenskii-Schiff and Bogoyavlensky-Konopelchenko Equations", Advances in Mathematical Physics, vol. 2020, Article ID 1458280, 10 pages, 2020. https://doi.org/10.1155/2020/1458280
Breather Wave Solutions and Interaction Solutions for Two Mixed Calogero-Bogoyavlenskii-Schiff and Bogoyavlensky-Konopelchenko Equations
In this paper, based on a bilinear differential equation, we study the breather wave solutions by employing the extended homoclinic test method. By constructing the different forms, we also consider the interaction solutions. Furthermore, it is natural to analyse dynamic behaviors of three-dimensional plots.
Recently, great attention has been paid to the study about exact solutions of nonlinear partial differential equations. So, it becomes more important to seek exact solutions of nonlinear partial differential equations (NLPDEs), which occur in many fields, such as chemistry, biology, optics, classical mechanics, acoustics, engineering, and social sciences. At present, many mathematicians have proposed a large number of methods to seek exact solutions, such as Bäcklund transformation , Hirota bilinear methods , homoclinic breather limit approach [3, 4], and Darboux transformation [5–12]. Among these methods, the Hirota bilinear method is one of the most critical and powerful methods. Recently, some new exact solutions of nonlinear partial differential equations have been constructed [13–22] by means of bilinear operator theories, so it has become an important research direction to study the dynamic properties of these new equations. In this article, the breather wave solutions will be discussed. On the basis of lump solution , the interaction solutions will be obtained.
The two mixed Calogero-Bogoyavlenskii-Schiff (CBS) and Bogoyavlensky-Konopelchenko (BK) equations  are usually written as where and , , are arbitrary constants. When the constants satisfy , and , the Calogero-Bogoyavlenskii-Schiff (CBS) and Bogoyavlensky-Konopelchenko (CBS-BK) equations will become a generalized Calogero-Bogoyavlenskill-Schiff (gCBS) equation  and a generalized Calagero-Bogoyavlenskii Konopelchenko equation , respectively. The CBS equation was first constructed by Bogoyavlenskii and Schiff in different ways [26, 27]. Namely, Bogoyavlenskii used the modified Lax formalism, whereas Schiff derived the same equation by reducing the self-dual Yang-Mills equation. In 2019, a class explicit lump solutions of the CBS-BK equation are constructed by using the Hirota bilinear approaches by Ren et al. . The ()-dimensional CBS equation also can be derived from the Korteweg-de Vries equation [28, 29]. Moreover, the BK equation is used as the interaction of a Rieman wave propagation , so we called the ()-dimensional nonlinear partial differential equation (1) as gCBS-BK equation. These two equations have been widely studied in different ways [29, 31–40].
2. The Bilinear Equation for gCBS-BK Equation
If we take where is an unknown real function, the bilinear equation of Equation (1) can be presented where , are all bilinear derivative operators and -operator  is defined by where and are the positive integers, is the function of and , and is the function of the formal variables and .
3. Breather Wave Solutions of CBS-BK Equation
In this section, we will use the extended homoclinic text method [41, 42] to get the breather wave solutions of Equation (1). To start with, where and are defined by where , , , and are all real numbers. Substituting Equation (5) into Equation (3), we can get the following.where , , and are some free real numbers.
Case 1. Substituting Equation (7) into Equation (5), through the transformation (2), we have where and are given by where , , , , , and are real numbers. Figure 1 described the evolution of solution (8).
Substituting Equation (10) into Equation (5), through the transformation (2), we have where and are determined by where , , , , and are real numbers. Therefore, the dynamic behavior can be performed in Figure 2.
Substituting Equation (13) into Equation (5), through the transformation (2), we have where and are given by where , , , , , , , and are free real numbers. Figure 3 described the evolution of solution (14).
and are given by where , , , , , , , and are real numbers.
and are given by where , , , , , , , , and are free real numbers. The three-dimensional dynamic figure can be drawn as Figure 5.
The figure is given as Figure 7.
and are followed by where , , , , , , , , , , and are free real numbers.
The figure is drawn as Figure 8.
and are defined by where , , , , , , , , , , and are free real numbers.
4. Interaction Solutions of CBS-BK System
4.1. Interaction between a Lump and One-Kink Soliton
With the help of Maple, we will discuss the interaction between a lump and one-kink soliton by taking as a combination of positive quadratic function and one exponential function, that is, where , , and are defined by where , , , , , and are all real numbers. In order to get the interaction solutions of Equation (1), substituting Equation (30) into Equation (2), where , , and are defined by where , , , , , and are all real numbers. Substituting Equation (30) into Equation (3), through complex analysis and calculations, we can have the following.
In order to obtain the dynamic feature, we choose Case 2 to analyse. The three-dimensional dynamic graphs are drawn as Figure 9. We can find that the lump waves and the exponential function waves interact with each other and keep moving in the opposite direction.
4.2. Interaction between a Lump and Periodic Waves
In order to get interaction solutions between a lump and periodic waves, we will take as the combination of positive function and hyperbolic cosine function. Therefore, can be determined by where variables are defined by where , , , , , and are all real numbers. Substituting Equation (39) into Equation (2), we can get the interaction solutions of Equation (1): where , , and are defined by where , , , , , and are real numbers. Through long and tedious calculations, we can get the following relations between the parameters.where , , , , , , and are free real numbers.where , , , , , , and are free real numbers.where , , , , , and are some free real numbers.where , , , and are free real numbers.
When we change the coefficients of the equation, the value of Equation (47) will be different accordingly. In order to obtain the dynamic feature, we choose Case 2 to analyse. Taking Equation (44) into Equation (41), we can get
With the help of Maple, the three-dimensional dynamic graphs are drawn as Figure 10. We can find that lump waves and periodic waves interact with each other and keep moving in the opposite direction.
In this paper, based on a bilinear differential equation, we study the breather wave solutions and the interaction solutions of the mixed Calogero-Bogoyavlenskii-Schiff and Bogoyavlensky-Konopelchenko equations. Compared with the existing results in the literature, our results are new. It will be extensively used to report many attractive physical phenomena in the fields of acoustics, heat transfer, fluid dynamics, classical mechanics, and so on. It is demonstrated that the Hirota operators are very simple and powerful in constructing new nonlinear differential equations, which possess nice math properties. It is interesting to study the interaction solutions between soliton solutions and period solution by making as a combination of exponential function and trigonometry function. However, this method can be applied to those equations which have Hirota bilinear forms. Furthermore, we also can study the quardrilinear forms and even polylinearity forms of this equation in the future. These questions may also be interesting and worth studying.
No data were used to support this study.
Conflicts of Interest
The authors declare that they have no conflicts of interest.
The work is supported by the National Natural Science Foundation of China (project Nos. 11371086, 11671258, and 11975145), the Fund of Science and Technology Commission of Shanghai Municipality (project No. 13ZR1400100), the Fund of Donghua University, Institute for Nonlinear Sciences, and the Fundamental Research Funds for the Central Universities.
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