Stream connector does not seem to work

[matthew-kapp]

Describe the bug 🐞

If I use h(t), [connect = Stream], h(t) is ignored during the connect() --> equations process

Expected behavior

The stream variable should not be ignored.

Minimal Reproducible Example 👇

Without MRE, we would only be able to help you to a limited extent, and attention to the issue would be limited. to know more about MRE refer to wikipedia and stackoverflow.

using ModelingToolkit, OrdinaryDiffEq
using ModelingToolkit: t_nounits as t

Not using connect=Stream produces 6 equations as expected:

# Components
@connector FluidPort begin
    @variables begin
        (h(t) = 1e5)
        (ṁ(t) = 1e5), [connect = Flow]
        p(t)
    end
end

@mtkmodel Source begin
    @parameters begin
        h_source
        p_source
        ṁ_source
    end

    @components begin
        outlet = FluidPort()
    end

    @equations begin
        outlet.h ~ h_source
        outlet.p ~ p_source
        outlet.ṁ ~ ṁ_source
    end
end

@mtkmodel Sink begin
    @components begin
        inlet = FluidPort()
    end
end

# system
@mtkmodel System begin
    @parameters begin
        h_source
        p_source
        ṁ_source
    end

    @components begin
        source = Source(; h_source=h_source, p_source=p_source, ṁ_source)
        sink = Sink()
    end

    @equations begin
        connect(source.outlet, sink.inlet)
    end
end

h_in = 1e5
p_in = 1e5
ṁ = 1e-3

@named sys_ = System(; h_source=h_in, p_source=p_in, ṁ_source=ṁ)
sys = complete(sys_)

for (i, eq) in enumerate(equations(sys))
    println("$i: $eq")
end

Error & Stacktrace ⚠️
1: source₊outlet₊h(t) ~ source₊h_source
2: source₊outlet₊p(t) ~ source₊p_source
3: source₊outlet₊ṁ(t) ~ source₊ṁ_source
4: source₊outlet₊h(t) ~ sink₊inlet₊h(t)
5: 0 ~ source₊outlet₊ṁ(t) + sink₊inlet₊ṁ(t)
6: source₊outlet₊p(t) ~ sink₊inlet₊p(t)
┌ Warning: outlet contains 1 flow variables, yet 2 regular (non-flow, non-stream, non-input, non-output) variables. This could lead to imbalanced model that are difficult to debug. Consider marking some of the regular variables as input/output variables.
└ @ ModelingToolkit C:\Users\matth.julia\packages\ModelingToolkit\aau6A\src\systems\connectors.jl:54
┌ Warning: inlet contains 1 flow variables, yet 2 regular (non-flow, non-stream, non-input, non-output) variables. This could lead to imbalanced model that are difficult to debug. Consider marking some of the regular variables as input/output variables.
└ @ ModelingToolkit C:\Users\matth.julia\packages\ModelingToolkit\aau6A\src\systems\connectors.jl:54

Using connect=Stream does not produce the 6th equation:

# Components
@connector FluidPort begin
    @variables begin
        (h(t) = 1e5), [connect = Stream]
        (ṁ(t) = 1e5), [connect = Flow]
        p(t)
    end
end

@mtkmodel Source begin
    @parameters begin
        h_source
        p_source
        ṁ_source
    end

    @components begin
        outlet = FluidPort()
    end

    @equations begin
        outlet.h ~ h_source
        outlet.p ~ p_source
        outlet.ṁ ~ ṁ_source
    end
end

@mtkmodel Sink begin
    @components begin
        inlet = FluidPort()
    end
end

# system
@mtkmodel System begin
    @parameters begin
        h_source
        p_source
        ṁ_source
    end

    @components begin
        source = Source(; h_source=h_source, p_source=p_source, ṁ_source)
        sink = Sink()
    end

    @equations begin
        connect(source.outlet, sink.inlet)
    end
end

h_in = 1e5
p_in = 1e5
ṁ = 1e-3

@named sys_ = System(; h_source=h_in, p_source=p_in, ṁ_source=ṁ)
sys = complete(sys_)

for (i, eq) in enumerate(equations(sys))
    println("$i: $eq")
end

1: source₊outlet₊h(t) ~ source₊h_source
2: source₊outlet₊p(t) ~ source₊p_source
3: source₊outlet₊ṁ(t) ~ source₊ṁ_source
4: 0 ~ source₊outlet₊ṁ(t) + sink₊inlet₊ṁ(t)
5: source₊outlet₊p(t) ~ sink₊inlet₊p(t)

Environment (please complete the following information):

• Output of using Pkg; Pkg.status()

Project ThermoFluid v0.1.0
Status `C:\Software projects on GitHub\Julia my own\ThermoFluid\Project.toml`
  [6e4b80f9] BenchmarkTools v1.6.0
⌃ [7c7805af] Clapeyron v0.6.10
  [e084ae63] CoolProp v0.2.0
⌃ [961ee093] ModelingToolkit v9.72.0
  [16a59e39] ModelingToolkitStandardLibrary v2.19.1
⌃ [1dea7af3] OrdinaryDiffEq v6.93.0
⌃ [91a5bcdd] Plots v1.40.12
  [fd094767] Suppressor v0.2.8
Info Packages marked with ⌃ have new versions available and may be upgradable.

• Output of using Pkg; Pkg.status(; mode = PKGMODE_MANIFEST)

Project ThermoFluid v0.1.0
Status `C:\Software projects on GitHub\Julia my own\ThermoFluid\Manifest.toml`
  [47edcb42] ADTypes v1.14.0
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  [7d9f7c33] Accessors v0.1.42
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  [ec485272] ArnoldiMethod v0.4.0
  [4fba245c] ArrayInterface v7.18.0
  [4c555306] ArrayLayouts v1.11.1
  [6e4b80f9] BenchmarkTools v1.6.0
  [e2ed5e7c] Bijections v0.1.9
  [d1d4a3ce] BitFlags v0.1.9
  [62783981] BitTwiddlingConvenienceFunctions v0.1.6
  [a134a8b2] BlackBoxOptim v0.6.3
⌃ [8e7c35d0] BlockArrays v1.6.1
  [70df07ce] BracketingNonlinearSolve v1.1.3
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  [a9c8d775] CPUTime v1.0.0
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⌃ [7c7805af] Clapeyron v0.6.10
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  [944b1d66] CodecZlib v0.7.8
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  [3da002f7] ColorTypes v0.12.1
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  [5ae59095] Colors v0.13.0
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⌅ [a80b9123] CommonMark v0.8.16
  [38540f10] CommonSolve v0.2.4
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  [e2d170a0] DataValueInterfaces v1.0.0
  [8bb1440f] DelimitedFiles v1.9.1
⌃ [2b5f629d] DiffEqBase v6.167.2
⌃ [459566f4] DiffEqCallbacks v4.4.0
  [77a26b50] DiffEqNoiseProcess v5.24.1
  [163ba53b] DiffResults v1.1.0
  [b552c78f] DiffRules v1.15.1
⌃ [a0c0ee7d] DifferentiationInterface v0.6.51
  [8d63f2c5] DispatchDoctor v0.4.19
⌃ [31c24e10] Distributions v0.25.118
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  [7c1d4256] DynamicPolynomials v0.6.1
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  [4e289a0a] EnumX v1.0.5
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  [d4d017d3] ExponentialUtilities v1.27.0
  [e2ba6199] ExprTools v0.1.10
  [55351af7] ExproniconLite v0.10.14
  [c87230d0] FFMPEG v0.4.2
  [7034ab61] FastBroadcast v0.3.5
  [9aa1b823] FastClosures v0.3.2
  [442a2c76] FastGaussQuadrature v1.0.2
  [a4df4552] FastPower v1.1.2
  [48062228] FilePathsBase v0.9.24
  [1a297f60] FillArrays v1.13.0
  [64ca27bc] FindFirstFunctions v1.4.1
  [6a86dc24] FiniteDiff v2.27.0
  [53c48c17] FixedPointNumbers v0.8.5
  [1fa38f19] Format v1.3.7
⌅ [f6369f11] ForwardDiff v0.10.38
  [069b7b12] FunctionWrappers v1.1.3
  [77dc65aa] FunctionWrappersWrappers v0.1.3
  [d9f16b24] Functors v0.5.2
  [46192b85] GPUArraysCore v0.2.0
⌃ [28b8d3ca] GR v0.73.13
  [c145ed77] GenericSchur v0.5.5
  [c27321d9] Glob v1.3.1
  [86223c79] Graphs v1.12.1
  [42e2da0e] Grisu v1.0.2
  [cd3eb016] HTTP v1.10.16
  [34004b35] HypergeometricFunctions v0.3.28
  [615f187c] IfElse v0.1.1
  [d25df0c9] Inflate v0.1.5
  [842dd82b] InlineStrings v1.4.3
  [18e54dd8] IntegerMathUtils v0.1.2
  [8197267c] IntervalSets v0.7.10
  [3587e190] InverseFunctions v0.1.17
  [92d709cd] IrrationalConstants v0.2.4
  [42fd0dbc] IterativeSolvers v0.9.4
  [82899510] IteratorInterfaceExtensions v1.0.0
⌃ [1019f520] JLFzf v0.1.10
  [692b3bcd] JLLWrappers v1.7.0
  [682c06a0] JSON v0.21.4
  [0f8b85d8] JSON3 v1.14.2
  [ae98c720] Jieko v0.2.1
⌅ [98e50ef6] JuliaFormatter v1.0.62
  [ccbc3e58] JumpProcesses v9.14.3
⌅ [ba0b0d4f] Krylov v0.9.10
  [b964fa9f] LaTeXStrings v1.4.0
  [23fbe1c1] Latexify v0.16.7
  [10f19ff3] LayoutPointers v0.1.17
  [5078a376] LazyArrays v2.6.1
  [87fe0de2] LineSearch v0.1.4
  [d3d80556] LineSearches v7.3.0
⌃ [7ed4a6bd] LinearSolve v3.7.2
  [2ab3a3ac] LogExpFunctions v0.3.29
  [e6f89c97] LoggingExtras v1.1.0
  [d8e11817] MLStyle v0.4.17
⌃ [1914dd2f] MacroTools v0.5.15
  [d125e4d3] ManualMemory v0.1.8
  [bb5d69b7] MaybeInplace v0.1.4
  [739be429] MbedTLS v1.1.9
  [442fdcdd] Measures v0.3.2
  [e1d29d7a] Missings v1.2.0
⌃ [961ee093] ModelingToolkit v9.72.0
  [16a59e39] ModelingToolkitStandardLibrary v2.19.1
  [2e0e35c7] Moshi v0.3.5
  [46d2c3a1] MuladdMacro v0.2.4
  [102ac46a] MultivariatePolynomials v0.5.7
  [d8a4904e] MutableArithmetics v1.6.4
  [337daf1e] NLSolvers v0.5.0
  [d41bc354] NLSolversBase v7.9.1
  [77ba4419] NaNMath v1.1.3
⌃ [8913a72c] NonlinearSolve v4.5.1
⌃ [be0214bd] NonlinearSolveBase v1.5.2
  [5959db7a] NonlinearSolveFirstOrder v1.3.1
  [9a2c21bd] NonlinearSolveQuasiNewton v1.2.1
  [26075421] NonlinearSolveSpectralMethods v1.1.1
⌃ [6fe1bfb0] OffsetArrays v1.16.0
  [4d8831e6] OpenSSL v1.4.3
  [429524aa] Optim v1.12.0
  [bac558e1] OrderedCollections v1.8.0
⌃ [1dea7af3] OrdinaryDiffEq v6.93.0
  [89bda076] OrdinaryDiffEqAdamsBashforthMoulton v1.2.0
  [6ad6398a] OrdinaryDiffEqBDF v1.4.0
⌃ [bbf590c4] OrdinaryDiffEqCore v1.22.0
  [50262376] OrdinaryDiffEqDefault v1.3.0
  [4302a76b] OrdinaryDiffEqDifferentiation v1.6.0
  [9286f039] OrdinaryDiffEqExplicitRK v1.1.0
  [e0540318] OrdinaryDiffEqExponentialRK v1.4.0
  [becaefa8] OrdinaryDiffEqExtrapolation v1.5.0
  [5960d6e9] OrdinaryDiffEqFIRK v1.10.0
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  [90014a1f] PDMats v0.11.34
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  [7713531c] PackedVectorsOfVectors v0.1.2
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  [69de0a69] Parsers v2.8.2
  [ccf2f8ad] PlotThemes v3.3.0
  [995b91a9] PlotUtils v1.4.3
⌃ [91a5bcdd] Plots v1.40.12
  [e409e4f3] PoissonRandom v0.4.4
  [f517fe37] Polyester v0.7.16
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  [2dfb63ee] PooledArrays v1.4.3
  [85a6dd25] PositiveFactorizations v0.2.4
  [d236fae5] PreallocationTools v0.4.26
⌅ [aea7be01] PrecompileTools v1.2.1
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⌃ [731186ca] RecursiveArrayTools v3.31.2
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  [05181044] RelocatableFolders v1.0.1
  [ae029012] Requires v1.3.1
  [ae5879a3] ResettableStacks v1.1.1
  [79098fc4] Rmath v0.8.0
  [f2b01f46] Roots v2.2.7
⌃ [7e49a35a] RuntimeGeneratedFunctions v0.5.13
  [9dfe8606] SCCNonlinearSolve v1.0.0
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⌃ [0bca4576] SciMLBase v2.84.0
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  [c0aeaf25] SciMLOperators v0.3.13
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⌃ [727e6d20] SimpleNonlinearSolve v2.2.1
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⌃ [a2964d1f] Wayland_jll v1.21.0+2
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⌅ [02c8fc9c] XML2_jll v2.13.6+1
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  [c834827a] Xorg_libSM_jll v1.2.6+0
⌃ [4f6342f7] Xorg_libX11_jll v1.8.6+3
  [0c0b7dd1] Xorg_libXau_jll v1.0.13+0
⌃ [935fb764] Xorg_libXcursor_jll v1.2.3+0
  [a3789734] Xorg_libXdmcp_jll v1.1.6+0
⌃ [1082639a] Xorg_libXext_jll v1.3.6+3
⌃ [d091e8ba] Xorg_libXfixes_jll v6.0.0+0
⌃ [a51aa0fd] Xorg_libXi_jll v1.8.2+0
⌃ [d1454406] Xorg_libXinerama_jll v1.1.5+0
⌃ [ec84b674] Xorg_libXrandr_jll v1.5.4+0
⌃ [ea2f1a96] Xorg_libXrender_jll v0.9.11+1
  [c7cfdc94] Xorg_libxcb_jll v1.17.1+0
⌃ [cc61e674] Xorg_libxkbfile_jll v1.1.2+1
  [e920d4aa] Xorg_xcb_util_cursor_jll v0.1.4+0
  [12413925] Xorg_xcb_util_image_jll v0.4.0+1
  [2def613f] Xorg_xcb_util_jll v0.4.0+1
  [975044d2] Xorg_xcb_util_keysyms_jll v0.4.0+1
  [0d47668e] Xorg_xcb_util_renderutil_jll v0.3.9+1
  [c22f9ab0] Xorg_xcb_util_wm_jll v0.4.1+1
⌃ [35661453] Xorg_xkbcomp_jll v1.4.6+1
⌃ [33bec58e] Xorg_xkeyboard_config_jll v2.39.0+0
  [c5fb5394] Xorg_xtrans_jll v1.6.0+0
  [3161d3a3] Zstd_jll v1.5.7+1
  [35ca27e7] eudev_jll v3.2.9+0
⌅ [214eeab7] fzf_jll v0.56.3+0
  [1a1c6b14] gperf_jll v3.1.1+1
  [a4ae2306] libaom_jll v3.11.0+0
  [0ac62f75] libass_jll v0.15.2+0
  [1183f4f0] libdecor_jll v0.2.2+0
  [2db6ffa8] libevdev_jll v1.11.0+0
  [f638f0a6] libfdk_aac_jll v2.0.3+0
  [36db933b] libinput_jll v1.18.0+0
  [b53b4c65] libpng_jll v1.6.47+0
  [f27f6e37] libvorbis_jll v1.3.7+2
  [009596ad] mtdev_jll v1.1.6+0
  [1317d2d5] oneTBB_jll v2022.0.0+0
⌅ [1270edf5] x264_jll v2021.5.5+0
⌅ [dfaa095f] x265_jll v3.5.0+0
  [d8fb68d0] xkbcommon_jll v1.4.1+2
  [0dad84c5] ArgTools v1.1.2
  [56f22d72] Artifacts v1.11.0
  [2a0f44e3] Base64 v1.11.0
  [ade2ca70] Dates v1.11.0
  [8ba89e20] Distributed v1.11.0
  [f43a241f] Downloads v1.6.0
  [7b1f6079] FileWatching v1.11.0
  [9fa8497b] Future v1.11.0
  [b77e0a4c] InteractiveUtils v1.11.0
  [4af54fe1] LazyArtifacts v1.11.0
  [b27032c2] LibCURL v0.6.4
  [76f85450] LibGit2 v1.11.0
  [8f399da3] Libdl v1.11.0
  [37e2e46d] LinearAlgebra v1.11.0
  [56ddb016] Logging v1.11.0
  [d6f4376e] Markdown v1.11.0
  [a63ad114] Mmap v1.11.0
  [ca575930] NetworkOptions v1.2.0
  [44cfe95a] Pkg v1.11.0
  [de0858da] Printf v1.11.0
  [9abbd945] Profile v1.11.0
  [3fa0cd96] REPL v1.11.0
  [9a3f8284] Random v1.11.0
  [ea8e919c] SHA v0.7.0
  [9e88b42a] Serialization v1.11.0
  [1a1011a3] SharedArrays v1.11.0
  [6462fe0b] Sockets v1.11.0
  [2f01184e] SparseArrays v1.11.0
  [f489334b] StyledStrings v1.11.0
  [4607b0f0] SuiteSparse
  [fa267f1f] TOML v1.0.3
  [a4e569a6] Tar v1.10.0
  [8dfed614] Test v1.11.0
  [cf7118a7] UUIDs v1.11.0
  [4ec0a83e] Unicode v1.11.0
  [e66e0078] CompilerSupportLibraries_jll v1.1.1+0
  [deac9b47] LibCURL_jll v8.6.0+0
  [e37daf67] LibGit2_jll v1.7.2+0
  [29816b5a] LibSSH2_jll v1.11.0+1
  [c8ffd9c3] MbedTLS_jll v2.28.6+0
  [14a3606d] MozillaCACerts_jll v2023.12.12
  [4536629a] OpenBLAS_jll v0.3.27+1
  [05823500] OpenLibm_jll v0.8.5+0
  [efcefdf7] PCRE2_jll v10.42.0+1
  [bea87d4a] SuiteSparse_jll v7.7.0+0
  [83775a58] Zlib_jll v1.2.13+1
  [8e850b90] libblastrampoline_jll v5.11.0+0
  [8e850ede] nghttp2_jll v1.59.0+0
  [3f19e933] p7zip_jll v17.4.0+2
Info Packages marked with ⌃ and ⌅ have new versions available. Those with ⌃ may be upgradable, but those with ⌅ are restricted by compatibility constraints from upgrading. To see why use `status --outdated -m`

• Output of versioninfo()

Julia Version 1.11.5
Commit 760b2e5b73 (2025-04-14 06:53 UTC)
Build Info:
  Official https://julialang.org/ release
Platform Info:
  OS: Windows (x86_64-w64-mingw32)
  CPU: 8 × AMD Ryzen 5 7520U with Radeon Graphics
  WORD_SIZE: 64
  LLVM: libLLVM-16.0.6 (ORCJIT, znver2)
Threads: 1 default, 0 interactive, 1 GC (on 8 virtual cores)

[cstjean]

Related? #3171

[matthew-kapp]

I guess the issue then is that there should be docs on how to use the stream connector?