This work presents the progress towards a mathematical modeling of the Arnold Engineering Development Complex (AEDC) Wind Tunnel 9 control law during the blow phase of a given tunnel run, composing of electrical analog physics, ideal gas control volume physics, incompressible fluid mechanics, and force balance kinematics. This work is unique to Tunnel 9 and unique in respect to other works, as no other existing models of the current control law exist. The primary goal of this work is to provide enhanced support to the Tunnel 9 engineers with the ability to model different run conditions. Key facility measurements can be estimated, aiding in the determination if proposed non-standard run conditions will meet or maintain the facility capabilities, and if the facility can be operated under safe operating limits. The secondary goal of this model is to progress toward a digitally controlled valve system to replace the current analog system. Such will help provide advantages in the facility (1) performance, (2) health monitoring, (3) maintainability, and (4) sustainment.