This presentation explains how Flownex can be used to determine PID controller tuning parameters using two widely adopted step-response methods: the Ziegler–Nichols Open-Loop method and the Cohen–Coon method. Both approaches use the system’s response to a controlled step change to calculate key process characteristics such as dead time, time constant, and process gain, which are then used to derive the controller’s proportional, integral, and derivative constants. Through a pump and piping system example, the video demonstrates how Flownex can generate step-response data, automatically log results to reports, and provide the information needed to perform the tuning calculations. The calculated PID parameters are then applied to the controller and validated through transient simulations, showing smooth and stable transitions to new setpoints. The presentation highlights Flownex’s reporting, control-system, and transient simulation capabilities, making it an effective platform for developing, tuning, and evaluating control strategies for thermal-fluid systems.