Computer simulation tools like Computational Fluid Dynamics (CFD) are readily available now to simulate engine air-flow systems such as intake and exhaust ports. These simulations require good CAD models, which enable the creation of CFD models very early in the engineering process—before actual testing is possible. From this early analysis, flow capacity and efficiency, much like that which comes from flowbench testing, can be generated. However, other flow field metrics also can be assessed both visually and numerically for in-cylinder mixture motion, flow separation, air velocity, etc. to determine the best design solution to go forward to hardware. This analysis can also lead to further detailed transient pulsing flow and combustion modeling. This session will explore these concepts—and more—in gripping detail.