Same simulation creating different results in different DWSIM versions
Simulate chemical processes using advanced thermodynamic models
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#286 Same simulation creating different results in different DWSIM versions
Hello Daniel. Try to calculate the flowsheet in the attached simulation. In DWSIM 6.4.0, it calculates mass flow for the vapor stream exiting the conversion reactor. In DWSIM 6.4.3 it doesn't. This is a reproduction from a ASPEN PLUS file, and it is expected that stream 6 should be a vapour-liquid mixture, as reported by DWSIM 6.4.0, not a pure liquid stream, as reported by 6.4.3. Took a look at the changelog and have no idea what change could have created this inconsistency between versions. The matter of the fact is that an older DWSIM versino is producing a result that is better than an newer DWSIM version.
PS: Several user-created compounds have been added to this simulation, most of them imported directly from online sources. I do believe that the error in version 6.4.3 is not caused by these coumpounds as one might think, since 6.4.0 handled the VLE "fine" (takes a long time to complete but it does complete"). Maybe the conversion reactor in 6.4.3 is not flashing?
PS2: Funny enough, the mass flow of the product streams in both simulations is different, even though reaction kinetics are setted to "mixture" phase (therefore the existence of a vapour or liquid phase should not matter).
What is the expected vapor fraction in 6? 0.0034?
0,00106176202371422 according to Aspen Plus. Have you been able to see the difference in your computer or is it my pc only?
v6.4.4 to be released today will give you 0.0034.
Excellent, the 0,023 difference may be from difference pure compound properties between the two softwares.
Thank you very much. Don't forget to add the 6.4 Milestone to the ticket system so we can select the correct milestone.
You should be using the GitHub issues section, I'll update the links. https://github.com/DanWBR/dwsim6/issues
Still getting 0.0505844 as reported by DWSIM 6.4.0. Is there something I'm missing?