Abstract
In this paper, we consider a (\(2+1\))-dimensional generalized Caudrey–Dodd–Gibbon–Kotera–Sawada (gCDGKS) equation, which is a higher-order generalization of the celebrated Kadomtsev–Petviashvili (KP) equation. By considering the Hirota bilinear form of the CDGKS equation, we study a type of exact interaction waves by the way of vector notations. The interaction solutions, which possess extensive applications in the nonlinear system, are composed by lump wave parts and soliton wave parts, respectively. Under certain conditions, this kind of solutions can be transformed into the pure lump waves or the stripe solitons. Moreover, we provide the graphical analysis of such solutions in order to better understand their dynamical behavior.
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1 Introduction
We all know that soliton solutions occupy a vital position in the nonlinear evolution equations (NLEEs). It is a popular topic to find exact solutions for NLEEs and has attracted a great many researchers. Over the past decade, many methods are provided to solve NLEEs, such as the Hirota bilinear method [1], inverse scattering transformation (IST) [2], and Darboux transformation (DT) [3,4,5,6,7,8]. Recently, the study of lump waves, which can be regarded as one kind of the rationally localized solutions, has become a hot topic both in the theory and experiment. Lump waves can be applied to various fields, such as nonlinear optic media, plasma, and shallow water wave [9,10,11]. Nowadays, many lump wave solutions have been found through the new direct method [12,13,14,15,16]. In addition, analyticity between lump solutions and the stripe solitons has been reported in [17,18,19,20]. Multifarious nonlinear systems in nature can be described well by the interaction solutions. Sometimes, this type of interaction solutions is used to forecast the appearance of rogue waves through analyzing the relations between rogue parts and twin-soliton parts [21].
In this work, we consider the following (\(2+1\))-dimensional generalized Caudrey–Dodd–Gibbon–Kotera–Sawada (gCDGKS) equation
where \(\alpha \) and \(\gamma \) are two constants and \(u=u(x, y, t)\) and \(v=v(x, y, t)\) are two differentiable functions with the variables x, y and t. It is a generalized form of the CDGKS equation introduced in [22], which is a higher-order generalization of the celebrated Kadomtsev–Petviashvili (KP) equation and widely employed in many physical branches. As a extended form of the KP equation, it can describe nonlinear dispersive physical phenomena well. gCDGKS Eq. (1) can be reduced to the (\(2+1\))-dimensional CDGKS equation for \(\alpha =\gamma =5\), which was first proposed by Konopelchenk and Dubovsky [22]. When \(\alpha =\gamma =5\) and \(u_{y}=0\), Eq. (1) changes into the (\(1+1\))-dimensional CDGKS equation, whose N-soliton solutions and integrabilities were found in [23, 24]. The other works for the (\(2+1\))-dimensional CDGKS equation were also carried out, including discussing quasiperiodic solutions and the interaction behaviors between solitons and cnoidal periodic waves [25,26,27].
To the best of our knowledge, although a great number of work have been researched about the CDGKS equation, the characteristics of the solitary waves and lump waves with interaction phenomena have not studied for gCDGKS Eq. (1). Based on the symbol calculation methods [28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45], the main propose of this paper is to study the lump waves based on the bilinear form and vector notations of (1). Then, we derive its one-soliton and two-soliton solutions. Furthermore, we analyze the interaction between lump waves and solitary waves. Finally, the graphical analysis of these solutions is analyzed in order to better understand their dynamical behavior.
The outline of this paper is as follows. In Sect. 2, we firstly derive the Hirota bilinear form of the generalized (\(2+1\))-dimensional CDGKS equation. Then through expression (6) with (7), we construct the special form of interaction solutions (7) for the equation in the case of three variables. In Sect. 3, based on these preconditions, we obtain its lump wave solutions . In addition, in Sect. 4, one-soliton and two-soliton solutions are derived in detail. In Sect. 5, we analyze the interaction between lump wave and solitary wave of the gCDGKS equation. Furthermore, we also display some plots to depict the propagation behaviors of these solutions. In last section, some conclusions of this work are discussed.
2 Mathematical analysis
2.1 Bilinear form
Based on the previous results [46,47,48,49,50,51,52,53,54,55,56,57], the Hirota bilinear form of the gCDGKS equation can be read by
under the transformations as follows
with
where the D-operator is denoted by
2.2 Theories analysis for the interaction solutions
In this section, we provide the following main theorem in order to find the interaction solutions of gCDGKS Eq. (1).
Main Theorem 1
gCDGKS Eq. (1) admits the interaction solutions as follows
with
where \(\varGamma \left( \partial _{x_{i}}\right) \) means a series of partial derivatives operations to \(x_{i} \left( i= 1, 2, \ldots n-1\right) \). \(\xi =\sum _{i=1}^{n}l_{i}x_{i}\), \(\chi ^{2}\) is the inner product of M dimension vector \(\mathbf {\chi }\) with respect to itself, and \(\mathbf {\chi }=\sum _{i=0}^{n}x_{i}\mathbf {P}_{i}\), \(\mathbf {P}_{i}=\left( P_{i1}, P_{i2}, \ldots , P_{iM}\right) \), wherein \(x_{0}=1, x_{n}=t\), \(p_{ij}=p_{ji}=\mathbf {P}_{i}\cdot \mathbf {P}_{j}=\sum _{m=1}^{M}P_{im}P_{jm} \left( i, j=0, 1, 2, \ldots n\right) \), and we have \(\chi ^{2}=\sum _{m=1}^{M}\chi _{m}^{2}\) . Moreover, nandM are both positive integers, and \(f_{0}, \kappa _{1}, \kappa _{2}, l_{i}\) are free scalar parameters.
The gCDGKS Eq. (1) admits the following interaction wave solutions
where \(\kappa _{1}, \kappa _{2}\) are free parameters, \(f_{0}, a_{0}, b_{0}, c_{0}\) are arbitrary scalar parameters to be known later, and \( \chi ^{2}=\mathbf {\chi }\cdot \mathbf {\chi }=\sum _{m=1}^{M}\chi _{m}^{2}\), \(\mathbf {\chi }\) is a M(M is positive integers)-dimensional vector which can be expressed by the constant vectors \(\mathbf {a}, \mathbf {b}, \mathbf {c}\), and \(\mathbf {\lambda }\) in the following form
where \(\mathbf {a}=(a_{1}, a_{2}, \ldots , a_{M}), \mathbf {b}=(b_{1}, b_{2}, \ldots , b_{M}), \mathbf {c}=(c_{1}, c_{2}, \ldots , c_{M}), \mathbf {\lambda }=(\lambda _{1}, \lambda _{2}, \ldots , \lambda _{M})\). Next, we introduce the symbols \(\varDelta _{12}=\mathbf {a}\,{\cdot }\, \mathbf {b}=\sum _{m=1}^{M}a_{m}b_{m}, \varDelta _{13}=\mathbf {a}\cdot \mathbf {c} , \varDelta _{23}=\mathbf {b}\cdot \mathbf {c}, \varDelta _{11}=a^{2}=\mathbf {a}\cdot \mathbf {a}, \varDelta _{22}=b^{2}=\mathbf {b}\cdot \mathbf {b} , \varDelta _{01}=\mathbf {a}\cdot \mathbf {\lambda }, \varDelta _{02}=\mathbf {b}\cdot \mathbf {\lambda }.\)
In terms of expression (8), it denotes that the solution consists of three parts, including rational solution \(f_{0}+\chi ^{2}\) (lump wave part), the exponential solution \(\kappa _{1}\text {e}^{\xi _{0}}\) (soliton part), and another exponential solution \(\kappa _{2}\text {e}^{-\xi _{0}}\) (soliton part), respectively. Therefore, if \(\kappa _{1}=\kappa _{2}=0\), solution (3) with expression (8) turns into a pure lump. On the other hand, the solution becomes a pure soliton with \(\chi ^{2}=0\). When \(\kappa _{1}\ne 0, \kappa _{2}=0\), and \(\xi _{0}\rightarrow +\,\infty \), the soliton solution part \(\kappa _{1}\text {e}^{\xi _{0}}\) will tend to infinity, and the lump solution part and the soliton solution part \(\kappa _{2}\text {e}^{-\xi _{0}}\) can be ignored. Similarly, the lump solution part is also discarded under the circumstances of \(\kappa _{2}\ne 0, \kappa _{1}=0\) and \(\xi _{0}\rightarrow -\,\infty \).
3 Lump wave solutions
Notably, when \(\kappa _{1}=\kappa _{2}=0\), we know that Eq. (8) degenerates to the pure lump waves, which are the rational solutions and localized in all directions in space, given by
Substituting (10) into (2), through symbolic computations with Maple, we can obtain
which yields a broad categories of lump waves (3) with (10) for Eq. (1).
In order to catch the arrival place of lump waves (3) with (10), we need to obtain the critical point of lump waves. Taking \(f_{x}=f_{y}=0\), we have
which can represent the travel path of the lump waves.
For presenting lump solutions specifically, we take \(M=2\), and then \( \mathbf {a}=(a_{1}, a_{2}), \mathbf {b}=(b_{1}, b_{2}), \mathbf {c}=(c_{1}, c_{2}), \mathbf {\lambda }=(\lambda _{1}, \lambda _{2})\). Through taking one of particular cases of (11), a series of constraining expressions for the parameters can be obtained (see [46]):
where \(a_{2}\ne 0\). Based on these parameters, the algebraic solutions (lump wave solutions) of Eq. (1) can be expressed in the form
with
and the travel path meets
where \(a_{2}, b_{1}, \lambda _{1}, \lambda _{2}, f_{0}\) are free scalar constants and \(\alpha \) is arbitrary scalar parameters. That means the lump waves move along the straight line
The amplitude of the lump waves should be considered, which can be obtained by solving the system \(\{u_{x}=0, u_{y}=0\}\). Therefore, the amplitude of the lump waves can be given by
which means that the amplitude just depends on the arbitrary constants of \(a_{2}, b_{1}, f_{0}\).
To understand more about lump waves (14), the graphical analysis is plotted in Fig. 1 in order to show some behaviors of the lump waves by selecting following free parameters:
4 Solitary wave solutions
In order to find the solitary wave solutions for Eq. (1), we expand the function f(x, y, t) with a formal expansion parameter \(\varepsilon \):
where the coefficients \(f^{(i)}=f^{(i)}(x, y, t)\) \((i=1, 2,\ldots )\) are some differentiable functions to be determined. Substituting (20) into bilinear form (2), and then taking all coefficients of the same powers of \(\varepsilon \) to equate zero, we have the soliton solutions of Eq. (1).
4.1 One-soliton solutions
In general, in order to seek one-solitary waves, above expansion (20) can be truncated based on \(f^{\left( i\right) }=0\left( i=2, 3, 4,\ldots \right) \), and we have
where \(\eta _{1}=h_{1}x+\rho _{1}y+\varrho _{1}t+\theta _{1}\), and \( h_{1}, \rho _{1}, \theta _{1}\) are constants. Then, putting (21) into (2), and let \(\varepsilon =1\), we find
Hence, the one-soliton solutions of Eq. (1) admit the following form
where \( h_{1}, \rho _{1}, \theta _{1}\) are real constants and \(\varrho _{1}\) is denoted by \(h_{1}, \rho _{1}\).
4.2 Two-soliton solutions
In the same way, for getting the two-soliton solutions, expansion (20) can be truncated based on \(F^{\left( i\right) }=0\left( i=3, 4, 5, \ldots \right) \), and we have
where \(f^{\left( 1\right) }=\text {e}^{\eta _{1}}+\text {e}^{\eta _{2}}\), \(f^{\left( 2\right) }=\text {e}^{\eta _{1}+\eta _{2}+\varOmega _{12}}\), \(\eta _{i}=h_{i}x+\rho _{i}y+\varrho _{i}t+\theta _{i},\) \(h_{i}\), \(\rho _{i}\) and \(\theta _{i}\) \((i=1,2)\) are all constants. Putting (24) into (2), and taking \(\varepsilon =1\), we have
Therefore, the two-soliton solutions of Eq. (1) have the following form
where \(\eta _{i}=h_{i}x+\rho _{i}y+\varrho _{i}t+\theta _{i}\left( i=1, 2\right) \), \(h_{i}, \rho _{i}, \theta _{i}\) \(\varrho _{i}\) are real constants and \(\varrho _{i}\) are denoted by \(h_{i}, \rho _{i}.\)
5 Interaction between lump waves and solitary waves
In this part, in order to analyze the interaction between lump waves and solitary waves, we discuss expression (8) in the case that \(\kappa _{1}, \kappa _{2}\) are not all zero. Substituting interaction solutions (8) into Eq. (2), with the help of Maple, we have
By considering (28) based on \(\mathbf {a}\cdot \mathbf {b}=\varDelta _{12}=0\), one finds
and
which yield the following constraining equations
where \(\alpha , \gamma \) are both parameters and \( a_{0}, \mathbf {a}, \mathbf {b}\) are arbitrary constant vectors.
Similarly, in order to display the interaction solutions in detail, we take \(M=2\) as a illustration; therefore, we have \(\mathbf {a}=(a_{1}, a_{2}), \mathbf {b}=(b_{1}, b_{2}), \mathbf {c}=(c_{1}, c_{2}), \mathbf {\lambda }=(\lambda _{1}, \lambda _{2});\) then according to constraining Eqs. (31), a series of constraining expressions for the parameters can be obtained by
where \(\alpha \ne 0, \gamma \ne 0\) and \(\frac{5}{\alpha }-\frac{25}{\gamma ^{2}}> 0.\) According to these parameters, interaction solutions (3) with (8) for Eq. (1) can be read by
with
where \(a_{1}, a_{2}, b_{1}, b_{2}, c_{1}, c_{2}, \lambda _{1}, \lambda _{2}, a_{0}\) are satisfied with constraining expressions (32) and \(\xi _{0}\) is written as \(a_{0}x+\frac{5a_{0}^{3}}{\gamma }y+\left( \frac{25\alpha }{36\gamma ^{2}}+\frac{1}{9}\right) t\).
5.1 Interaction between lump waves and line single-soliton waves
When \(\kappa _{2}=0\), solution (33) implicates the interaction between lump waves and line single-soliton waves. In the following, we provide several related figures to show interaction solutions (33) by selecting following two sets of different free parameters:
Figure 4 shows the process of traveling waves for the interaction between lump waves and line single-soliton waves based on parameter selections (35). As shown in Fig. 4, the wave is composed by two part, including lump wave part and single-soliton wave part, respectively. Apparently, from Fig. 4a, d, we easily find that lump wave begins to be swallowed by single-soliton, and when \(t\rightarrow -\,\infty \), the lump wave vanishes gradually, and only the soliton wave exists. The two waves collide over a period of time, exactly as the time at \(t={-180}\) displayed in Fig. 4b, e; at the moment, the the lump turns to tangle with the soliton, and the amplitudes and shapes of lump wave and line single-soliton wave are changed. But when \(t\rightarrow +\,\infty \), they are separated from each other and propagate along the respective directions and recover their original amplitudes and shapes, which can be explicitly observed from Fig. 4c, f. On the other hands, when we choose \(\kappa _{1}=0, \kappa _{2}=0.1\) instead of \(\kappa _{1}=0.1, \kappa _{2}=0\), the other parameters remain unchanged, and some similar figures can be exported from Fig. 4 through transforming (x, y, t) into \((-x, -y, -t)\).
5.2 Interaction between lump waves and line twin-soliton waves
When \(\kappa _{1}\ne 0, \kappa _{2}\ne 0\), solution (33) means the interaction between lump waves and line twin-soliton waves.
Case I: Choosing the same parameters as in (35) except for \(\kappa _{2}=0.1\), the interaction solution is shown in Fig. 5.
Case II: When
the interaction solution is shown in Fig. 6.
Figures 5 and 6 hold up interaction between lump waves and line twin-soliton waves. As shown in Fig. 5a, d and c, f, the lump wave turns to tangle with one of the soliton and then begins to be swallowed by ones until to be vanish with \(t\rightarrow -\,\infty \) or \(t\rightarrow +\,\infty \). When time comes \(t=0\) in Fig. 5b, e, the lump appears with arriving its peak. The identical phenomena can be acquired in Fig. 6 based on different parameters.
6 Conclusions and discussions
In this work, gCDGKS Eq. (1) has been investigated. Based on the Hirota bilinear form of Eq. (1) and vector symbolic computations, we have obtained lump solutions (14) and interaction solutions (33). Firstly, we have provided the Hirota bilinear form of Eq. (1) and defined a type of interaction solutions (7) and given its special case (8) for Eq. (1). Then, we have indicated that interaction solutions (8) reduce to the lump waves for \(\kappa _{1}=\kappa _{2}=0\) and provided the lump solutions for Eq. (1). Next, soliton solutions have been found by Hirota bilinear method. Moreover, we have calculated interaction solutions (33) based on \(\mathbf {a}\cdot \mathbf {b}=0\) and analyzed the interaction phenomena between lump wave and solitary wave. In order to analyze the dynamical behaviors of these solutions (include lump waves, soliton waves, interaction solutions between lump solutions and one stripe soliton or a pair of resonance stripe solitons), we have drawn six figures with Figs. 1, 2, 3, 4, 5 and 6 under some free parameters. In this work, it is necessary to note that the dimension M of these vector can be took as 3 or some other positive integer, not just for 2. Finally, we need to emphasize that the prominent approach we employ still adapt to find some other classes of lump and interaction solutions for other models well. In the near future, more works remain to be solved for the nonlinear evolution equations in the fields of mathematical physics and engineering.
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Acknowledgements
The authors would like to thank the editor and the referees for their valuable comments and suggestions. This work was supported by the Research and Practice of Educational Reform for Graduate students in China University of Mining and Technology under Grant No. YJSJG_2017_049, the No. [2016] 22 supported by Ministry of Industry and Information Technology of China, the Qinglan Engineering project of Jiangsu Universities, the National Natural Science Foundation of China under Grant Nos. 11301527 and 51522902, the Fundamental Research Funds for the Central Universities under Grant No. DUT17ZD233, and the General Financial Grant from the China Postdoctoral Science Foundation under Grant Nos. 2015M570498 and 2017T100413.
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Peng, WQ., Tian, SF., Zou, L. et al. Characteristics of the solitary waves and lump waves with interaction phenomena in a (2 + 1)-dimensional generalized Caudrey–Dodd–Gibbon–Kotera–Sawada equation. Nonlinear Dyn 93, 1841–1851 (2018). https://doi.org/10.1007/s11071-018-4292-0
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DOI: https://doi.org/10.1007/s11071-018-4292-0