Dynamic Process Model The key difference between the steady-state models and dynamic process models is the ability to take into account variation over time. However, as can be seen below the difference is not simply the addition of a time dimension; dynamic modeling often brings a whole different approach that results in dynamic models being a much truer-to-life representation of the process in many other respects. While steady-state analysis is mainly used for process flowsheet design, usually to determine mass and energy balances and approximate equipment sizes, or perhaps stream properties, the ability of dynamic models to model transient behavior opens up a whole new world of application. Typical applications of dynamic models are as follows: analysis of transient behavior, including performance during start-up, shutdown, and load change; regulatory i. Python Scripting in DWSIM The scripting capability in DWSIM allows the user to execute additional tasks in the simulation through the use of Python scripts, which have access to all objects in the flowsheet, the solver and the simulation itself. You can play with the objects in the flowsheet, do calculations using property packages, get data from external sources, run multiple cases while changing properties between runs and much more.
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We need to do these from time to time, but the projects are too infrequent to justify acquiring an Aspen license or something comparable. Thermo should be thermo regardless of software.
At the beginning of the Part 1 simulation just with the separator vessel and pump in place, before implementing the recycle stream the tutorial shows a liquid flow rate of The tutorial shows a liquid kinematic viscosity of 0.
For that matter, if I do the same simulation using all the properties with the carbon counts in the component name "Methane C1 " instead of "Methane", "Isobutane iC4 " instead of "IsoButane", etc. I get different answers. Using all the carbon count component names got my liquid viscosities much closer to the tutorial 0. Nor am I inclined to trust a program with a major difference on a pump power calculation between versions 2.
Given how intuitive the UI is, I was surprised to stumble across the calculation discrepancies. Last edit: Alex M If you would like to refer to this comment somewhere else in this project, copy and paste the following link: Can you attach your simulation file?
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:.
Creating a material stream in DWSIM - English
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Dynamic Simulation Tutorial with DWSIM and Python, Part 1: Concepts and Steady-State Model
Dwsim Tutorial Manuals