  We have developed the general grid method for multi-channel scattering of
bosonic atoms inside a harmonic waveguide with transverse anisotropy. This
approach is employed to analyze elastic as well as inelastic multi-channel
confined scattering. For the elastic scattering, the effects of the range and
form of interatomic potential and the waveguide anisotropy on the confinement
induced resonance are studied. We have also investigated quantitatively the
reactive rate constant in confined atom-atom collisions. It is found that a
slight anisotropy to the confining trap considerably enhances the reactive rate
constant in multi-channel regime.
