New enhancements have been made to Computational Fluid Dynamics (CFD) modeling software capability for process and chemical engineers, with the release of CFX-4.4 from AEA Technology Engineering Software (Waterloo, ON, Canada). The software allows the highly complex, fluid dynamic, heat transfer, and chemical processes that occur in mixing vessels to be predicted accurately and efficiently. Valuable enhancements include a new free-surface modeling tool that accurately tracks the gas/liquid interface through grid movement.