The widely spread hydrocode uses the specific volume V and the specific internal energy E as independent thermodynamic variables. Because of that fact the thermodynamically consistent implementation of the hydrocode requires the complete equation of state (EOS) in the form S = S(V,E), where S is the specific entropy. We suggest a complete non-Gruneisen operational EOS for hydrocode which has 3 functional degrees of freedom, namely, 3 functions of one-variable each: A(V), P(E),and A(V).
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