Abstract
Traveling wave solutions to Kawahara equation (KE), transmission line (TL), and Korteweg–de Vries (KdV) equation are found by using an elliptic function method which is more general than the \(\mathrm {tanh}\)-method. The method works by assuming that a polynomial ansatz satisfies a Weierstrass equation, and has two advantages: first, it reduces the number of terms in the ansatz by an order of two, and second, it uses Weierstrass functions which satisfy an elliptic equation for the dependent variable instead of the hyperbolic tangent functions which only satisfy the Riccati equation with constant coefficients. When the polynomial ansatz in the traveling wave variable is of first order, the equation reduces to the KdV equation with only a cubic dispersion term, while for the KE which includes a fifth order dispersion term the polynomial ansatz must necessary be of quadratic type. By solving the elliptic equation with coefficients that depend on the boundary conditions, velocity of the traveling waves, nonlinear strength, and dispersion coefficients, in the case of KdV equation we find the well-known solitary waves (solitons) for zero boundary conditions, as well as wave-trains of cnoidal waves for nonzero boundary conditions. Both solutions are either compressive (bright) or rarefactive (dark), and either propagate to the left or right with arbitrary velocity. In the case of KE with nonzero boundary conditions and zero cubic dispersion, we obtain cnoidal wave-trains which represent solutions to the TL equation. For KE with zero boundary conditions and all the dispersion terms present, we obtain again solitary waves, while for KE with all coefficients present and nonzero boundary condition, the solutions are written in terms of Weierstrass elliptic functions. For all cases of the KE we only find bright waves that are propagating to the right with velocity that is a function of both dispersion coefficients.
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Acknowledgements
The author would like to acknowledge Professor Pisin Chen from Leung Center for Cosmology and Particle Astrophysics (LeCosPA) for support during his stay in Taipei, and Professors Juan-Ming Yuan and Haret C. Rosu for their helpful comments and discussions on Kawahara equation.
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Appendix
Appendix
Lemma 1
Traveling wave solutions to KE (1), satisfy only the Weierstrass elliptic equation with cubic nonlinearity.
Proof
Letting
For KdV equation (14) \(u=Y\) and the leading term for the second order derivative term is \(u_{\xi \xi } =\frac{1}{2} M a_M Y^{M-1}\). By matching the terms \(u^2\) with \(u_{\xi \xi }\) in Eq. (15) we obtain \(M=3\). For KE (1) \(u=Y^2\) and the leading term for the fourth order derivative term is \(u_{\xi \xi \xi \xi }=\frac{1}{2} M(M+2)(3M-2) {a_M}^2 Y^{2(M-1)}\). By matching the terms \(u^2\) and \(u_{\xi \xi \xi \xi }\) in Eq. (7) we also obtain \(M=3\). Notice that this method will not work if an ODE contains both even and odd derivative terms. \(\square \)
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Mancas, S.C. Traveling Wave Solutions to Kawahara and Related Equations. Differ Equ Dyn Syst 27, 19–37 (2019). https://doi.org/10.1007/s12591-017-0367-5
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DOI: https://doi.org/10.1007/s12591-017-0367-5