[unilord]

Hey Guys

I am performing a centrifugal pump CFD analysis in OpenFoam 11 (where there is no more AMI, and they use NCC instead) and I am facing some problems in residuals. They do not go below 10^-3 for pressure. However, when comparing the data with the experiment from a scientific paper, the head (pressure in outlet - pressure in inlet) is below 3% error.

I wondered what was happening and inserted a flow rate probe in the NCC interfaces. I saw that, in outlet and inlet, the flow rate is 0.0063 m^3/s, which is the supposed. However, in NCC interfaces, it behaves like this:

NCC1_2 - Positive and negative values, ranging from e-27 to e-28
NCC2_1 - Same negative value, 7.935464e-14

NCC2_3 - Same positive value, 1.197136e-18
NCC3_2 - Positive and negative values, ranging from e-34 to e-35

The interfaces are curved. Can someone help me on this?