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[Zen]

Hi all, i want to perform an analysis of air recirculation and determine the percentage of dirty air that enters the intake duct (forcing fan system, 2 ducts). I am having difficulty defining the boundary condition for the intake forcing duct so that it can draw air from velocity inlet tunnel 1 and 2 as shown in the picture. 

For the time being, I have tried to define the front part of the duct as the "fan" boundary condition and set a constant speed of 19.6 m/s. However, when generating the report, why does the duct not showing any air velocity?


As can be seen in velocity contour 1 (blue contour). Also in the streamline report, it can be seen that the forcing duct is not drawing any air at all. What is the problem? can someone help me step by step to fix it?