I was able to repeat the results in this validation:
However, if I increase the velocity to 4.664 m/s, the pressure loss that is calculated is almost twice as high as that calculated from the Darcy-Weisbach equations. Is this because the higher the velocity in the pipe, the longer the pipe needs to be to get to a fully developed flow (i.e. Entrance Length) or is it something else that is deviating? The entrance length does not change much (+30%) with going to a higher velocity so I didn't think that would have that much of an impact.