Computation and Stability of Traveling Waves in Second Order Evolution Equations

W.-J. Beyn, D. Otten, J. Rottmann-Matthes
2018 SIAM Journal on Numerical Analysis  
The topic of this paper are nonlinear traveling waves occuring in a system of damped waves equations in one space variable. We extend the freezing method from first to second order equations in time. When applied to a Cauchy problem, this method generates a comoving frame in which the solution becomes stationary. In addition it generates an algebraic variable which converges to the speed of the wave, provided the original wave satisfies certain spectral conditions and initial perturbations are
more » ... ufficiently small. We develop a rigorous theory for this effect by recourse to some recent nonlinear stability results for waves in first order hyperbolic systems. Numerical computations illustrate the theory for examples of Nagumo and FitzHugh-Nagumo type. Key words. Systems of damped wave equations, traveling waves, nonlinear stability, freezing method, second order evolution equations, point spectra and essential spectra.
doi:10.1137/16m108286x fatcat:gs2qmj3dy5bhxn2lc4i5ypjzue