Where can I find documentation for instream()

dodoplus · June 26, 2022, 12:18pm

It seems that MTK has an instream() operator.
I think this is inspired by Modelica’s similarly named operator.

Are there any examples using instream()? I could only find a single test using it (in state_selection.jl).

Thanks,
DD

ohmsweetohm1 · June 26, 2022, 2:08pm

Not really an example

SciML/ModelingToolkit.jl/blob/44405a796d9e91ebe67ec1dec2caed06a81885dc/test/state_selection.jl#L49


      
                 u ~ z + a]
          
          
lorenz1 = ODESystem(eqs, t, name = :lorenz1)
          let al1 = alias_elimination(lorenz1)
              let lss = partial_state_selection(al1)
                  @test length(equations(lss)) == 2
              end
          end
          
          
# 1516
          let
              @variables t
              D = Differential(t)
          
          
    @connector function Fluid_port(; name, p = 101325.0, m = 0.0, T = 293.15)
                  sts = @variables p(t)=p m(t)=m [connect = Flow] T(t)=T [connect = Stream]
                  ODESystem(Equation[], t, sts, []; name = name)
              end
          
          
    #this one is for latter
              @connector function Heat_port(; name, Q = 0.0, T = 293.15)

dodoplus · June 26, 2022, 2:29pm

Yeah - that’s the one I found. Not very illuminating.

I more-or-less understand Modelica inStream. However, there they also have an actualStream operator which is missing here. I think actualStream can be implemented via ifelse, so I’m not sure we need it.

dodoplus · June 26, 2022, 2:30pm

PS:

https://github.com/SciML/ModelingToolkit.jl/issues/1666