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I'm running a simulation that has a lower pressure drop than what I'm reading from a similar experimental test set up. In the test set up, there is a fan at the inlet whereas in the simulation the inlet is just velocity with uniform flow. I'm guessing the higher losses in the experiment are due to fan swirl, because all the dimensions between the two are exact. How do I account for the extra DP in the experimental set up caused by the fan? I have tried messing with the turbulence intensity and other settings but that had zero influence.