Dear All,
Is it possible to know which algorithm/steps aspen plus is using for simulation.
For example is it possible to see the formulas,algorithm and steps aspen plus is using to find out composition at each stage is RADFRAC column?
Regards
Belal
I don't know which algorithm they actually chose for ASPEN but here is a nice discussion of some algorithms that could be used for the task. that might be of interest.
https://www.sciencedirect.com/topics/engineering/iterative-convergence
The general idea is to reduce the relationship to one unknown typically something like fraction vaporized and iterate to find a solution.
If you have the operating manual for Aspen - Hysys, you can find the formulas and equations, I don't remember about algorithms.
I think code from the original ASPEN project (MIT late 70's) are publicly available but they have probably changed quite a bit in the past 40 years. FWIW most of the convergence algorithms I have seen or developed from KBC/Aspen/Hyprotech typically use a simple Newton convergence technique with adjustable step sizes. For most problems I usually keep track of max that is too low and min that is too high and move to interval halving when the next guess is outside those bounds.
Dear Mohd
I hope this information can be used by you
If you want to know which equations use the radfrac model, you'd watch the Inside out method for solving distillation columns, These algorithm could be useful to understand how ASPEN plus solving the Temperature, composition, and pressure profiles!
If you want to investigate more deep, I recommed you a book (You can find free online) called "
Distillation Design And Control Using Aspen Simulation - Luyben (2013)
Link: https://archive.org/details/LuybenW.2013DistillationDesignAndControlUsingAspenSimulation2E
Greatings
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