I have what I thought was a fairly simple problem, but it is giving me all sorts of problems converging. Background: I'm solving for flow and forces on a valve to find conditions as the valve strokes. So, I have flow through a series of orifices (solving for an intermediate pressure) and those pressures lead to forces that must balance against other forces (e.g. a spring). So, it solves that without any issue. Then I want to get more complicated and I use the solve block to calculate a simple parameter like flow velocity - then it starts having trouble. Note, velocity doesn't affect the flow or force equations - I'm just looking for a value. Sometimes it will solve it, but I have to get the guesses right on. So, am I not formulating this right? The blocks in red are what cause a problem when I enable them. I've tried many ways of entering the guess values but nothing seems very robust. Thanks!
3.1 and pdf attached.
