So I have run into an interesting problem with the default numerics. My project is related to the “Turbulent Pipe Flow” validation project (@dzivkovic). I have a different pipe diameter and length with two back to back 45 bends. When I use the default numerics, the simulation does not converge as well or as quickly. However, when I use the numerics in the Turbulent Pipe Flow validation, it converges much better and faster plus the results are different (pressure loss). I don’t remember seeing anything documented about the changes to the numerics in that write up. Quite a few of the numerics are different from the default. Can someone please explain the changes from the default and why they are behaving as they are?