Abstract
The behavior of specific dispersive waves in a new \((3+1)\)-dimensional Hirota bilinear (3D-HB) equation is studied. A Bäcklund transformation and a Hirota bilinear form of the model are first extracted from the truncated Painlevé expansion. Through a series of mathematical analyses, it is then revealed that the new 3D-HB equation possesses a series of rational-type solutions. The interaction of lump-type and 1-soliton solutions is studied and some interesting and useful results are presented.
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1 INTRODUCTION
In the last few decades, nonlinear evolution (NLE) equations have been considered by a lot of researchers in the field of mathematical physics. It is known that exact solutions extracted from NLE equations provide comprehensive information about real-world phenomena. For this reason, searching for exact solutions of NLE equations plays a vital role in mathematical physics and is the major topic of many works. An attractive kind of exact solutions is referred to as rational-type solutions which include soliton, lump, lump-kink, breather-wave, and rogue-wave solutions. Because of the importance of these types of exact solutions, a wide range of scholars have devoted their studies to looking for rational-type solutions of nonlinear evolution equations. For example, Wazwaz and El-Tantawy in [1] exerted the simplified Hirota method to seek solitons of \((3+1)\)-dimensional KP\(-\)Boussinesq and BKP\(-\)Boussinesq equations. In another work performed by Manukure et al. [2], lump solutions of a \((2+1)\)-dimensional extended Kadomtsev – Petviashvili equation were obtained by making use of quadratic test functions. Lump-kink solutions to the KP equation were constructed in [3] by considering an ansatz which is a combination of positive quadratic and exponential functions. Lan [4] reported breather-wave and rogue-wave solutions of a generalized \((3+1)\)-dimensional B-type Kadomtsev – Petviashvili equation with the variable coefficient using the homoclinic test technique. For more papers, see [5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36].
The fundamental purpose of the present article is to study a new 3D-HB equation in fluids in the following form:
or
and to retrieve a bunch of rational-type solutions for it by exerting a number of effective techniques.
It is worthy of note that by considering \(c_{3}=0\), the above new 3D-HB equation is reduced to the 2D-HB equation which has been considered by Hua et al. in [37]. Hua and his collaborators extracted interaction solutions of the 2D-HB equation by utilizing a series of ansatz techniques. Hosseini et al. [38] also found rational wave solutions of the 2D-HB equation with different structures by means of a number of useful approaches.
The structure of this paper is as follows: In Section 2, by using the truncated Painlevé expansion, the Bäcklund transformation and Hirota bilinear form of the new 3D-HB equation are formally derived. In Section 3, a series of test functions is applied to obtain rational-type solutions of the new 3D-HB equation. The last section presents the outcomes of the current article.
2 BÄCKLUND TRANSFORMATION AND HIROTA BILINEAR FORM OF THE MODEL
According to the truncated Painlevé expansion, the Bäcklund transformation of the system (1.2) can be written as
where \(f\) is a function of variables \(x,y,z,\) and \(t\). The functions \(u_{2}\) and \(v_{2}\) are arbitrary solutions of the new 3D-HB equation and \(u_{0}\), \(u_{1}\), \(v_{0}\), and \(v_{1}\) are unknown functions including the derivatives of \(f\).
Now, by inserting (2.1) into the system (1.2) and solving the resulting system obtained by equating the coefficients of \(f^{-6}\) and \(f^{-3}\) to zero, we obtain
Similarly, by considering \(u_{2}=v_{2}=0\), the relations presented in (2.2), and equating the coefficients of \(f^{-5}\) and \(f^{-2}\) to zero, we arrive at a system of nonlinear PDEs whose solution gives
Substituting the above results into (2.1) finally results in the following Bäcklund transformation for the new 3D-HB equation:
Based on the Bäcklund transformation (2.3), Hirota bilinear form corresponding to the new 3D-HB equation can be written as
where \(D_{x},D_{y},D_{y},\) and \(D_{z}\) are Hirota’s bilinear operators.
3 RATIONAL-TYPE SOLUTIONS OF THE NEW 3D-HB EQUATION
In the present section, rational-type solutions of the new 3D-HB equation with different structures are formally established by exerting a number of effective techniques.
3.1 Soliton Solutions
To derive soliton solutions of the governing model, we substitute \(u={{e}^{{{k}_{i}}x+{{\tau}_{i}}y+{{\xi}_{i}}z+{{\varsigma}_{i}}t}}\) into the linear terms of (1.1) and solve the resulting equation for \({\varsigma}_{i}\). After that, the dispersion relation \({\varsigma}_{i}\) can be written as
and so
where \(\theta_{i},1\leqslant i\leqslant 3\) are phase variables. Now, by considering the dependent variables
and the exponential function
we obtain \(R=2\). Accordingly, the following 1-soliton solution can be obtained:
Now, we formally take
as the auxiliary function in order to retrieve the following 2-soliton solution:
It is noted that the phase variables \(\theta_{i},i=1,2\) are defined as above and the phase shift \(a_{12}\) is given as
The special 3-soliton solution of the new 3D-HB equation, namely,
where
can be achieved if and only if the following 3-soliton condition is satisfied [39, 40]:
in which \(P=yt+c_{1}x^{3}y+c_{2}y^{2}+c_{3}z^{2},V_{i}=(k_{i},\tau_{i},\xi_{i},\varsigma_{i}),\) and \(S=\{(1,1,1),(1,1,-1),(1,-1,1),\) \((-1,1,1)\}.\) The 1-soliton, 2-soliton, and special 3-soliton solutions of the new 3D-HB equation are presented in Figs. 1–3, presenting the behavior of dispersive waves.
3.2 Lump-type Solutions
To retrieve lump-type solutions of the new 3D-HB equation, we exert a test function as follows:
where
and \(a_{i},1\leqslant i\leqslant 11\) are real constants to be computed later. By setting (3.1) in (2.4) and adopting specific operations, we find the following results:
Now, a lump-type solution is obtained as
such that
The lump-type solution of the new 3D-HB equation given by (3.2) is demonstrated in Fig. 4 for a special choice of free parameters.
3.3 Interaction Solutions
To derive interaction solutions of the new 3D-HB equation, we employ the following test function:
where
and \({{a}_{i}},1\leqslant i\leqslant 11\) and \({{k}_{j}},1\leqslant j\leqslant 4\) are real constants to be calculated, and \(k\) is a positive real constant. By substituting (3.3) into (2.4) and applying specific operations, we find
Now we find the following interaction solution:
in which
Three-dimensional and density plots of the interaction solution (3.4) are illustrated in Figs. 5 and 6 for different choices of \(t\).
It is worthy of note that when \(-c_{1}k_{1}^{3}>0\) and \(t\rightarrow+\infty\), the lump-type solution vanishes and the 1-soliton solution stays.
3.4 Breather-wave and Rogue-wave Solutions
To obtain breather-wave solutions of the new 3D-HB equation, we use the following ansatz:
where
By setting (3.5) in (2.4) and applying specific operations, we derive
Now a breather-wave solution is found as
where
Now, by assuming \(b_{0}=-2,\tau=k\), and \(k\rightarrow 0\), the following rogue-wave solution can be obtained:
where
The breather-wave and rogue-wave solutions are formally plotted in Fig. 7 for a special choice of free parameters.
4 CONCLUSION
In the present paper, a new \((3+1)\)-dimensional Hirota bilinear equation has been developed and its rational-type solutions have been obtained successfully. In this respect,
-
the truncated Painlevé expansion was utilized to derive the Bäcklund transformation and Hirota bilinear form of the model;
-
soliton solutions were extracted by applying the simplified Hirota method and the 3-soliton condition;
-
the lump-type solution was established by considering two positive quadratic functions as an ansatz;
-
the interaction solution was retrieved by exerting an ansatz composed of two positive quadratic functions and an exponential function;
-
the breather-wave solution and its corresponding rogue-wave solution were constructed by adopting the homoclinic test technique.
In the end, the interaction of lump-type and 1-soliton solutions was studied and some interesting and useful results were presented.
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Hosseini, K., Samavat, M., Mirzazadeh, M. et al. A New \((3+1)\)-dimensional Hirota Bilinear Equation: Its Bäcklund Transformation and Rational-type Solutions. Regul. Chaot. Dyn. 25, 383–391 (2020). https://doi.org/10.1134/S156035472004005X
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DOI: https://doi.org/10.1134/S156035472004005X