[siw]

I was playing in CFX 2021 R2 by simulating turbulent airflow through a smooth pipe with a very low minimum RMS residual limit of 1E-21. I noticed that the mass and momentum RMS residual equations in CFX-Solver Manager were nicely decreasing but suddenly flat-lined at 1E-15, likewise the two SST k and omega plots. I do not recall CFX flat-lining residual levels in previous versions so is this something new? Again, I'm not aiming for a discussion about assessing convergence etc. as I was just playing about in CFX, but rather is a cap new in CFX.