New Complex Hyperbolic Structures to the Lonngren-Wave Equation by Using Sine-Gordon Expansion Method

Haci Mehmet Baskonus
  • Department of Mathematics and Science Education, Harran University, Sanliurfa, Turkey
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, Hasan Bulut and Tukur Abdulkadir Sulaiman
  • Department of Mathematics, Firat University, Elazig, Turkey
  • Department Mathematics, Federal University Dutse, Jigawa, Nigeria
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Abstract

In this paper, a powerful sine-Gordon expansion method (SGEM) with aid of a computational program is used in constructing a new hyperbolic function solutions to one of the popular nonlinear evolution equations that arises in the field of mathematical physics, namely; longren-wave equation. We also give the 3D and 2D graphics of all the obtained solutions which are explaining new properties of model considered in this paper. Finally, we submit a comprehensive conclusion at the end of this paper.

1 Introduction

Over some decades, the field of nonlinear evolution equations (NEEs) has attracted the attention of many researchers. NEEs are broadly used to describe problems in science, engineering and mathematical physics such as fluid dynamics, plasma physics, hydro magnetic waves, optic fibers, solid state physics and many others. NEEs can also be used to describe the propagation of a nonlinear dispersive waves in inhomogeneous media [1, 2]. It has become an important bottom-line to find the analytical solutions to these types of equations. Several methods for finding the solutions of various NEEs have been proposed and/or improved by many scholars [3, 4, 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, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71].

The aim of this paper was to apply the sine-Gordon expansion method (SGEM) to find a new solutions to the Lonngren-wave equation [14].

(uxxαu+βu2)tt+uxx=0,

where α and β are real constants. The equation describes the electric signals in telegraph lines on the basis of the tunnel diode [15, 16]. The Lonngren-wave equation was used as an example by Akcagil and Aydemir [14] to show the existence of strong connection between the (GG)-expansion method and the modified extended tanh method.

SGEM is a method for solving different nonlinear partial differential equations that is developed based on wave transformation and te sine-Gordon expansion method [17]. A new hyperbolic function solutions to the Davey-Stewartson equation with power-law nonlinearity was obtained in [18] by using SGEM. With the aid of symbolic computation, a new transformation was developed using the general sine-Gordon travelling wave reduction equation and a generalized transformation to obtain the solutions of various types of nonlinear differential equations [19]. A considerable investigation has been implemented by Yan [20] to sine-Gordon-type equations where the equations are systematically solved by using the Jacobi elliptic function expansion method.

The remaining parts of this paper are organized as follows: In Section 2, we discuss the general facts of the SGEM. In Section 3, we apply the SGEM to the Lonngren-wave equation given in Eq. (1). Section 4 is about results, discussion and some remarks. We finally, give the conclusion of this paper in Section 5.

2 General Facts of the SGEM

In this section we discuss the general facts of SGEM.

Consider the following sine-Gordon equation [17, 21, 22]:

uxxutt=m2sin(u),

where u = u(x, t) and m is a real constant.

Applying the wave transformation u = u(x, t) = U(ξ), ξ = μ (xct) to Eq. (2), yields the following nonlinear ordinary differential equation (NODE):

U=m2μ2(1c2)sin(U),

where U = U(ξ), ξ is the amplitude of the travelling wave and c is the velocity of the travelling wave. Reconsidering Eq. (3), we can write its full simplification as:

[(U2)]2=m2μ2(1c2)sin2(U2)+K,

where K is the integration constant.

Substituting K = 0, w(ξ) = U2 and a2 = m2μ2(1c2) in Eq. (4), gives:

w=asin(w),

Putting a = 1 in Eq. (5), we have:

w=sin(w),

Equation (6) is variables separable equation, we obtain the following two significant equations from solving it:

sin(w)=sin(w(ξ))=2peξp2e2ξ+1|p=1=sech(ξ),

cos(w)=cos(w(ξ))=p2e2ξ1p2e2ξ+1|p=1=tanh(ξ),

where p is the integral constant.

For the solution of the following nonlinear partial differential equation;

P(u,ux,ut,uxx,utt,uxt),

we consider,

U(ξ)=i=1ntanhi1(ξ)[Bisech(ξ)+Aitanh(ξ)]+A0,

Equation (10) can be rewritten according to Eqs. (7) and (8) as follows:

U(w)=i=1ncosi1(w)[Bisin(w)+Aicos(w)]+A0.

We determine the value n under the terms of NODE by the balance principle. Letting the coefficients of sini(w)cosj(w) to be all zero, yields a system of equations. Solving this system by using Wolfram Mathematica 9 gives the values of Ai, Bi, μ and c. Finally, substituting the values of Ai, Bi, μ and c in Eq. (10), we obtain the new travelling wave solutions to Eq. (9)

3 Applications

Consider the Lonngren-wave equation given in Eq. (1);

Applying the transformation u = u(x, t) = U(ξ), ξ = μ (xct) to Eq. (1), we have:

c2μ2U+(1c2α)U+c2βU2=0

We obtain n = 2, by applying the balance principle on Eq. (12). With n = 2 and using Eq. (11), yields:

U(w)=B1sin(w)+A1cos(w)+B2cos(w)sin(w)+A2cos2(w)+A0.

Differentiating Eq. (13) twice, gives:

U(w)=B1cos2(w)sin(w)B1sin3(w)2A1sin2(w)cos(w)+B2cos3(w)sin(w)5B2sin3(w)cos(w)4A2cos2(w)sinw(w)+2A2sin4(w),

Putting Eqs. (13) and (14) in Eq. (12), yields;

A0c2α A0 + c2β A02 + A1cos(w) − c2α A1cos(w) - 2c2μ2A1sin2(w)cos(w) + 2c2β A0A1cos(w) + c2β A12cos2(w) + A2cos2(w) − c2α A2cos2(w)

−4c2μ2A2cos2(w)sin2(w) + 2c2μ2A2sin4(w) + 2c2β A0A2cos2(w)+

2c2β A1A2cos3(w) + c2β A22cos4(w) + B1sin(w) − c2α B1sin(w) +

c2μ2B1cos2(w)sin(w) − c2μ2B1sin3(w) + 2c2β A0B1sin(w)+

2c2β A1B1cos(w)sin(w)+ 2c2β A2B1cos2(w)sin(w) + c2βB12sin2(w)

+ B2cos(w)sin(w) − c2α B2cos(w)sin(w) + c2μ2B2cos3(w)sin(w)−

5c2μ2B2sin3(w)cos(w) + 2c2β A0B2cos(w)sin(w) + 2c2β A1B2cos2sin(w)

+ 2c2β A2B2cos3sin(w) + 2c2β B1B2sin2(w)cos(w) + c2β B22cos2(w)sin2(w) = 0.

We collect a set of algebraic equations by equating each summation of the coefficients of the trigonometric terms of the same power to zero in the abovementioned equation. We solve the set of generated to obtained the values of the coefficients. To get the new solitary solutions, u(x, t) to Eq. (1), we substitute in each case the obtained results of the coefficients into Eq. (10) along with n = 2.

  1. Case-1When we consider following coefficients:
    A0=2μ2β,A1=0,B1=0,A2=6μ2β,B2=0,α=1c24μ2,
    these produce new dark solution as:
    u1(x,t)=2μ2β(13tanh[μ(xct)]2).
    Fig. 1
    Fig. 1

    The 3D and 2D surfaces of Eq. (15).

    Citation: Applied Mathematics and Nonlinear Sciences 4, 1; 10.2478/AMNS.2019.1.00013

  2. Case-2If it is taken as
    A0=6μ2β,A1=0,B1=0,A2=6μ2β,B2=0,α=1c2+4μ2,
    they produce a new singular solution as:
    u2(x,t)=6μ2βsech[μ(xct)]2.
  3. Case-3When we take
    A0=2μ2β,A1=0,B1=0,A2=3μ2β,B2=3iμ2β,α=1c2μ2,
    they give mixed complex singular solution as:
    u3(x,t)=μ2β(1+3ii+sinh(μ(xct))).
    Fig. 2
    Fig. 2

    The 3D and 2D surfaces of Eq. (16).

    Citation: Applied Mathematics and Nonlinear Sciences 4, 1; 10.2478/AMNS.2019.1.00013

    Fig. 3
    Fig. 3

    The 3D and 2D surfaces of Eq. (17).

    Citation: Applied Mathematics and Nonlinear Sciences 4, 1; 10.2478/AMNS.2019.1.00013

  4. Case-4
    A0=3(c2α1)c2β,A1=0,B1=0,A2=33c2αc2β,B2=3i(c2α1)c2β,μ=c2α1c,
    give mixed complex rational solution as:
    u4(x,t)=3i(c2α1)c2β(isinh[(c2α1c)(xct)]).
    Fig. 4
    Fig. 4

    The 3D and 2D surfaces of Eq. (18).

    Citation: Applied Mathematics and Nonlinear Sciences 4, 1; 10.2478/AMNS.2019.1.00013

  5. Case-5
    A0=22c2αc2β,A1=0,B1=0,A2=3(c2α1)c2β,B2=3i(c2α1)c2β,μ=ic2α1c,
    which produces the following trigonometric travelling wave solution as:
    u5(x,t)=1c2β(c2α1+3(c2α1)1+sin[(xct)c2α1c]).
    Fig. 5
    Fig. 5

    The 3D and 2D surfaces of Eq. (19).

    Citation: Applied Mathematics and Nonlinear Sciences 4, 1; 10.2478/AMNS.2019.1.00013

  6. Case-6
    A0=3μ2β,A1=0,B1=0,A2=3μ2β,B2=3iμ2β,c=1αμ2,
    which introduces the following complex mixed solution as:
    u7(x,t)=3μ2βsech[μ(x+tαμ2)](sech[μ(x+tαμ2)]+itanh[μ(x+tαμ2)]).
    Fig. 6
    Fig. 6

    The 3D and 2D surfaces of Eq. (20).

    Citation: Applied Mathematics and Nonlinear Sciences 4, 1; 10.2478/AMNS.2019.1.00013

4 Results and Discussion

The powerful SGEM as one of the prominent methods for obtaining the some new travelling wave solutions to the nonlinear partial differential equations has been used in this paper. This method is based on both important properties of the sine-Gordon equation such as Eqs. (7) and Eq.(8). The SGEM includes trigonometric functions, which will be used later for obtaining novel solutions in Eq.(11). Many new solutions can be obtained by using the properties of these trigonometric functions. This is one of the main properties of SGEM. Therefore, it gives many coefficients to the considered model such as complex, exponential and trigonometric.

5 Conclusions

In this manuscript, by selecting of some of them, we have obtained the same solution, Eq.(15); moreover, we have found some entirely new complex, exponential, dark and hyperbolic solutions to the model considered when we compared the solutions obtained with the help of exp the (G′/G)-expansion method and the modified extended tanh method used in [14]. These solutions are new physical properties of model equation Eq.(1.1). The effectiveness and the simplicity of the method show that its powerful and reliable mathematical tool that can be applied in solving various NEEs. For computational calculations, we have used the packet programs for drawing graphical surfaces in this paper. To the best of our knowledge, the application of SGEM to the Lonngren-wave equation has not been submitted to the literature beforehand.

Communicated by Juan Luis García Guirao

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    P.J. Olver, Evolution equations possessing infinitely many symmetries, J. Math. Physics, 18 (1977) 1212-1217.

  • [2]

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