A Critical Warning message in AFT Impulse.

An infinite pipe boundary on an Assigned Pressure or Assigned Flow junction is designed to have zero reflections. Transient cavitation that occurs at the junction is a sure sign of reflections. The infinite pipe model is not appropriate.

Furthermore, any cavitation that would occur in the real pipe past the infinite pipe boundary but does not occur because that part of pipe is being neglected also means that the infinite pipe model is not appropriate.