Feedback from Freeze-out in Hydrodynamics
  Most hydrodynamical calculations used in heavy-ion physics ignore the effect of freeze-out matter carrying energy and momentum away from the expanding fluid. In a simple one-dimensional model we compare calculated energy density and velocity profiles, with and without interaction between fluid-like and freeze-out parts of the system, in order to estimate the importance of this effect. 
John J. Neumann, Boris Lavrenchuk and George Fai (Center for Nuclear   Research, Kent State University)