Results of the comparative analysis of modeling in DEFORM and LS-DYNA of process rainfall of aluminum samples are given in a capsule packages with experimental data. The qualitative picture and size of deformation received when modeling practically coincide with results of pilot studies. Thus, it is possible to tell about adequacy of the developed computer models and possibility of their use when modeling processes rainfall, and also more difficult processes of deformation in which relative density changes insignificantly.For more difficult processesof deformationof preparationsof powder materials (extrusion, equal-channel angular pressing, rolling) at which the interval of change of density lies in significantly wider range,itis necessaryto usethe mathematical modelsand conditionsof fluidity adapted for these conditions, in particular an elliptic condition of fluidity in which twomechanical characteristics are used: a fluidity limit at shift and a fluidity limit at hydrostatic compression.