this paper presents different ways to simulate a jet engine nozzle motion. The case helps to validate the use of the new software SAMCEF Field & SAMCEF Mecano/Motion on complex nozzle mechanism. It also gives an overview of potential areas of interest for the design of future systems. After a quick sum-up of engine nozzle design philosophy, we will detail the various phases to define the mechanism model, from use of CAD model to detailed analysis.