Special Session 31: Nonlinear Waves and Solitons

The strongly coupled nonlinear Schr odinger equations are studied numerically to gain insight into an increasingly complex family of collision interactions. Speci cally, the case of apparent repulsion between soliton solutions are considered in terms of phase velocity, relative shift, and apparent trajectory. Both elastic and inelastic collisions are discussed. −→∞ ∞←− anisotropic e ects on poroacoustic waves Brian Straughan Durham University, England [email protected] Nonlinear acceleration waves are considered in porous media. Our goal is to assess the e ect of anisotropy on poroacoustic waves. We show anisotropy may have a pronounced e ect on sound attenuation. We consider this aspect in the case of "designer" porous materials which are being produced with regard to sound and heat insulation.