http://www.cadfamily.com/downinfo/300682.html
Rigorous three phase calculations are performed for all equations of state and activity models with the exception of the Wilson equation, which only performs two phase vapour-liquid calculations. UniSim Thermo uses internal intelligence to determine when it can perform a flash calculation on a stream, and then what type of flash calculation needs to be performed on the stream.
This is based completely on the degrees of freedom concept. When the composition of a stream and two property variables are known, (vapour fraction, temperature, pressure, enthalpy or entropy, one of which must be either temperature or pressure), the thermodynamic state of the stream is defined.
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