CFD (Computational Fluid Dynamics) has been used extensively in many industries including aeronautical, marine, and environmental. The petroleum industry, over the past few years, has now fully embraced the use of CFD in equipment design and troubleshooting. CFD is used to predict how fluid will flow within separators, pumps, mixers, etc as well as around objects such as buildings or ships. Fluid-structure interaction can also be modeled such as wave motion on hulls. Combustion and radiation processes can also be modeled. CFD is used in lieu of building prototypes or even full scale models with the cost savings being substantial. But what exactly is CFD? The basic idea behind CFD is to set up equations for the conservation of mass, momentum, and energy for the volume in which fluid flows. This is achieved by dividing the larger volume into a finite number of smaller volumes (cells), for which the conditions are considered to be constant. By solving these equations, the conditions in all the cells can then be calculated. Once the equations are solved, the pertinent information such as pressure and velocity can be displayed. In this month''s SPE presentation, industry users will present and discuss their applications of CFD. The format is in the form of a panel where each panelist will briefly discuss their use of CFD. The meeting will then be open for questions and comments from the attendees.