Caption: This CFD model predicts fluid trajectory inside a 350 MWe tangential coal-fired boiler. Colour represents flue gas temperature. In the first clip, the image on the left is the baseline fluid trajectory from burners showing bulk flue gas rotation; the image on the right is the fluid trajectory from ROFA nozzles installed on left and right sides of the boiler. In the second clip, the video on left is a side view of the fluid trajectory from ROFA nozzles, and the image on the right is a plan view, or aerial view.