Dielectric Barrier Discharge plasma actuators are one of the most promising techniques of active flow control. They act by ionizing the air around them and generating a body force on the fluid which can be used to manipulate the airflow. Due to their many advantages, most of all their capability of inducing a self-limiting discharge, DBDs have multiple applications in aerodynamics, from delaying flow separation to enhancing jet mixing. Despite the interest that these actuators have drawn in the last couple of decades, the phenomena that they generate are not fully understood. Because of this, many models have been developed to study their operation.