Specification block not updated / solved

[andr1976]

Describe the bug
When using specification block, these are not (always) updated with the solver. Some are , some are not

Expected behavior
All specification blocks should update when solver is invoked

Screenshots

Desktop (please complete the following information):

• OS: [e.g. Windows,
• Version [e.g. v8.32]

See attached file
Hydrogen_density.zip

[DanWBR]

@andr1976 the spec is a hack. It is triggered after the source object is calculated. The final result will depend on the calculation order and how the specs are connected. I do not recommend using specs (I don't do it).

[andr1976]

Uhh, what a shame - I find this the only simple way of avoiding too many independent specs in a flowsheet

[andr1976]

I still think this is a bug since the behaviour is unpredictable and not as expected - with a specifier you actually expect the specification to be set after the solver has been called, but this is not always the case apparently.

[DanWBR]

I still think this is a bug since the behaviour is unpredictable and not as expected - with a specifier you actually expect the specification to be set after the solver has been called, but this is not always the case apparently.

It depends. When I had the idea to add the spec, I thought that the user would want to set a property of an object far away and ahead of the source in a well-defined flowsheet but, of course, people are using the spec for everything you can imagine. Your sample is a total hack and unexpected use case, but I understand what you want to do.

Again, python scripts are perfectly suited for what you want but I also understand that you don't want to use them. 🙂

[DanWBR]

a script triggered after "1" finishes calculating would do the trick:

ms1 = Flowsheet.GetObject("1")
ms2 = Flowsheet.GetObject("2") 
ms3 = Flowsheet.GetObject("3") 
ms4 = Flowsheet.GetObject("4") 
ms5 = Flowsheet.GetObject("5") 

P = ms1.GetPressure()

ms2.SetPressure(P)
ms3.SetPressure(P)
ms4.SetPressure(P)
ms5.SetPressure(P)

[andr1976]

Ok I get your point, believe me I do want to use Python scripting :-)

[DanWBR]

@andr1976 I've added a new field to flowsheet settings, it should suit your needs.

[andr1976]

Wuhuuu, thats just awesome Daniel :-)

[andr1976]

Now I am just being greedy here, could something similar be applied to the spreadsheet, that any imported/exported properties are updated after the solver finishes, before a final solver run to ensure everything has been updated? I know this is a separate topic.

[DanWBR]

Now I am just being greedy here, could something similar be applied to the spreadsheet, that any imported/exported properties are updated after the solver finishes, before a final solver run to ensure everything has been updated? I know this is a separate topic.

@andr1976 maybe, if you reconsider your recent patreon decision... 🧐 👀 you know I have a lot of DWSIM and non-DWSIM stuff to do.

[andr1976]

Or maybe just consider moving to DK and come work with me - we will do great things my friend, my ramblings and your ingenuity :-)

[DanWBR]

Or maybe just consider moving to DK and come work with me - we will do great things my friend, my ramblings and your ingenuity :-)

@andr1976 pay me 10K €/month and I'll be there ✈️🚀

[andr1976]

I don't see that option on Patreon, ah haha - maybe DM is better if we should continue this conversation :-)

[DanWBR]

I don't see that option on Patreon, ah haha - maybe DM is better if we should continue this conversation :-)

@andr1976 just kidding. I'll see what I can do about th spreadsheet 😄👍🏻