Saroj,

Conveyor Dynaimcs, Inc. (CDI) is also studying in the area of fluid, gas and solids. What form of constitutive model are you developing? Is the process new beyond: Finite Volume, Finite Element, Finite Difference, Lattice Boltzman, Smooth Particle Hydrodynamics (SPH)?

I have a keen interest in you field of study and may be able to assist in some collaboration. Please contact me and hopefully send details to the undersigned name and email address:

Others have built Finite Volume and Finite Element models using variable density gases. These do not capture the true physical behavior. It is better than a guess and can be tuned to give reasonable results. However, there are better ways to combine solids, fluids, and gases with free surfaces that are stable. THe big "if" is in the size of the model and the time necessary to reach equilibrium. ■