Has anyone ever had the opportunity to compare flow simulation results to actual test data? How did it compare? I'm running internal flow on a swivel head for a hydraulic torque wrench to find the pressure drop across it. When compared to actual lab data, flow simulation predicted consistently lower values. I defined an inlet volume flow, and an outlet static pressure (ambient), then surface goals on the inlet and outlet to find the static pressure difference. I defined hydraulic oil as a custom liquid, so perhaps the viscosity or density is slightly different, but it wouldn't be as significant as what was seen. I'll attach a screenshot of the graphs for reference.