This thesis aspires to provide a preliminary analysis of unsteady forcing in a transonic compressor. The study and research conducted is placed within the Advanced Research Into Aeromechanical Solutions (ARIAS) project: the experimental results obtained from the Technische Universität Darmstadt (TUD) compressor test rig are used as a starting point of the work. A critical pattern of wake generator is taken into account, with staggered blades and attention is devoted to the first mode excited by engine order 3. This configuration leads to high stresses in the first mode and for this reason simulations are necessary to predict possible failures without compromising the experimental setup.