Issues regarding ProII convergence
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First case: In a system, the initial condition is set to A, and the calculation converges； Then, by changing condition A of the system to condition B, the calculation still converges. Second scenario: In the same system, if the condition is set to B from the beginning, the calculation will not converge. What is the reason for this? Is it because, in the first case, the calculation of condition A provides a better initial value for the calculation of condition B?
Well, as LZ said, it should be the case that this is how it works – because certain parameters such as the percentage composition are difficult to converge on in just one step, whereas flow rate parameters can be converged on more easily. This means that it’s necessary to start with good initial values first, and then set the more difficult convergence conditions; I think this is exactly the issue LZ is referring to