[en] The authors present a theoretical description of nuclear collisions which consists of a three-dimensional fluid-dynamical model, a chemical equilibrium break-up calculation for local light fragment (i.e. p, n, d, t, ³He, ⁴He) production and a final thermal evaporation of these particles. The light fragment cross section and some properties of the heavy target residues are calculated for the asymmetric systems Ne+U at 400 MeV/N, Ne+Pb at 800 MeV/N and C+Sn at 86 MeV/N. The results of the model calculations are compared with recent experimental data. Several observable signs of the collective hydrodynamical processes are consistent with the present data. An event-by-event analysis of the flow patterns of the various clusters is proposed which can yield deeper insight into collision dynamics. (author)