The anode subsystem of a PEM fuel cell (PEMFC) plays a crucial role in ensuring the efficient and stable operation of the overall system. To enhance the efficiency of the PEMFC, it is essential to minimize the energy consumption of auxiliary subsystems, such as the mechanical compressor used in the anode recirculation loop. One promising approach is the use of passive recirculation through an ejector, which operates without any external power consumption. However, the design of ejectors is highly complex due to their performance sensitivity to the operating conditions of the PEMFC system. To better understand their behavior and identify potential performance improvements, computational fluid dynamics (CFD) simulations can be employed.