Previously, large simulation problems have not been feasible with equation of state (EOS) compositional models. This paper describes an approach for efficient EOS calculations. Tests of a simulator based on the approach, show that large problems can now be solved. For example, a problem composed of 9-components, 20,000 grid points, and 1,000 time steps can be solved in approximately 40 minutes of CPU time on a Cray X-MP.

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