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Multistage flash (MSF) technology is widely used in saline water desalination particularly in Middle East and North Africa and Gulf Cooperation Council countries. Enhancement in the thermal performance of this technology in different plant sections and processes including the brine flashing process is still promising. This study addresses the optimal position of jumping plate (weir) location and its number inside the MSF chamber. The optimization exercise has been carried out in terms of maximum flashing vapor production and lower pressure drop using commercial computational fluid dynamics software ANSYS CFX 12.1. The Eulerian-Eulerian (free surface flow) two-phase model was adopted while a k-ε model was used a turbulent flow model. The theoretical model was verified by comparing the predicated results with those obtained from the reference case study. The maximum deviation between both results was found to be within 8.3%. Prediction of velocity vectors, phase volume fraction, and temperature profile are presented. The results showed that a middle single weir in the flash chamber has the highest thermal and hydraulic performance. [ABSTRACT FROM AUTHOR]