How to set up the convergence module in process simulation
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Because the entire process is solved using a sequential procedure, I always find it very difficult when encountering processes with loops. The instructions state to tear from here, calculate using an initial value, and then compare it with the calculated value; repeating this process until the two values converge. I don’t know how to set the convergence; could someone experienced give me some advice? Thank you!
The larger the value set for Tolerance, the easier it is to achieve convergence; you can start by changing 0.0001 to 0.001. Trace threshold determines the minimum concentration of a component that is taken into account in the calculations – components with concentrations lower than this value will not affect the results. In the Trace option, ‘cutoff’ refers to the use of the fixed value specified in the Trace threshold, while ‘Gradual’ means that this value changes gradually as the number of calculations increases.
Thanks to the person above! :handshake
For logistics with a loop, how can it be indicated that the parameters of the incoming feed stream and those of the outgoing stream are equal? Thank you
May I ask how exactly is this “gradual” method carried out? Could you elaborate a bit more?
Personally, I think the tolerance should only be changed as a last resort; in other words, it should be adjusted only if the error levels shown in the convergence results fall within an acceptable range. If the tolerance is too high, the process becomes too lenient and not practical. You can run each module separately first, then connect them in a cyclic flow, and after that set it up as a turbulent flow. Relying solely on Aspen to handle everything on its own is not realistic