NUMERICAL-SIMULATION OF LIQUID-LIQUID AGITATED DISPERSIONS ON THE VAX6520 VP/

This work began as a study of the implementation of a liquid-liquid hy drodynamic and mass transfer simulation algorithm on the VAX 6000 mode l 520 vector processor. A scalar code developed by Ribeiro et al.(3) h as proved adequate and accurate to describe the transient and the limi ting hydrodynamic steady-state, either of a continuous or of a batch l iquid-liquid contactor; it also may be extended to predict the mass tr ansfer performance of this type of system. Using this pre-existing FOR TRAN code, we describe some techniques for modifying it in order to ta ke advantage of the VAX 6000 vector architecture. The main thrust of t his investigation is to identify the characteristics of the VAX vector processor that affect performance, and to show how that performance i nformation can be used to build optimized algorithms. The nature of th e modifications made to the algorithm and their effect on the overall computation time are reported for two types of changes: scalar optimiz ation and vectorization.