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Re:Ask HN: Why isn’t visual programming a bigger thing? by dongping on Thursday May 21, 2020 @08:36AM (#23257641)
Maybe you want to look at Modelica [1] for inspiration? It is an open modeling language standard with open source implementations. It should do what you want. maybe abit too declarative however (you can always use the algorithm block instead of the equation block though).

[1] https://www.modelica.org/

Re:Ask HN: Why isn’t visual programming a bigger thing? by w_t_payne on Thursday May 21, 2020 @09:42AM (#23258211)
I was aware of OpenModelica, but hadn't looked at the project in any great depth. I think it's a lot more ambitious than my project, which is restricted (at present) to a single model of computation.