Rapid phase stability calculations in fluid flow simulation using simple discriminating functionsRapid phase stability calculations in fluid flow simulation using simple discriminating functions Peer-Reviewed Journal Publication Δημοσίευση σε Περιοδικό με Κριτές 2019-10-072018enThis paper presents a new phase stability method that is applicable when repeated phase behavior calculations are needed as it is the case with multiphase fluid flow compositional simulation in upstream petroleum engineering. Two discriminating functions act as classifiers in such a way that a positive value of one of the two functions determines the stability state of the mixture. The two functions are generated off line, prior to the simulation, and their expressions are very simple so that they can be evaluated rapidly in a non-iterative way for every discretization block and at each timestep during the simulation. The CPU time required for phase stability calculations is dramatically reduced while still obtaining correct classification results corresponding to the global minimum of the system Gibbs energy function. The method can be applied to any chemical engineering problem where the class of several objects needs to be determined repeatedly and quickly.http://creativecommons.org/licenses/by/4.0/Computers and Chemical Engineering108112-127 Gaganis Vasileios Γαγανης Βασιλειος Elsevier Classification algorithm Multiphase fluid flow simulation Phase stability analysis Upstream petroleum engineering