In this paper we use the modified tanh-coth method to solve the Kawahara and the modified Kawahara equations. New multiple traveling wave solutions are obtained for the Kawahara and the modified Kawahara equations. 2000 Mathematics Subject Classification: 35K01; 35J05.

We investigate the limit behavior of the solutions to the Kawahara equation ut + u3x + εu5x + uux = 0 , ε > 0 as ε → 0. In this equation, the terms u3x and εu5x do compete together and do cancel each other at frequencies of order 1/ √ ε. This prohibits the use of a standard dispersive approach for this problem. Nervertheless, by combining different dispersive approaches according to the range o...

We study orbital stability of solitary waves of least energy for a nonlinear Kawahara type equation (Benney-Luke-Paumond) that models long water waves with small amplitude, from the analytic and numerical viewpoint. We use a second-order spectral scheme to approximate these solutions and illustrate their unstable behavior within a certain regime of wave velocity.

In this manuscript, we consider the internal control problem for fifth-order KdV type equation, commonly called Kawahara on unbounded domains. Precisely, under certain hypotheses over initial and boundary data, can prove that there exists an input such solutions of equation satisfy integral overdetermination condition. This condition is satisfied when domain posed in real line, left half-line, ...

The damped Kawahara equation (KE) is nonintegrable and does not have analytical integration. In this work, the powerful numerical method, which reduce differential transformation method (RDTM), devoted to solve KE. accuracy of proved. results are compared with different methods. solution axi-symmetric wave shows effect damping term successfully. We confirmed that RDTM useful for solving equatio...