Below is a simplified version of a model I’m working on. In this model, two parallel dynamic pipes exchange heat through convection with a flow composed of two dynamic pipes. The system has been simplified, and the values used are arbitrary to maintain confidentiality.

I’m working on a very complex thermohydraulic model with parallel flows from more than three sources. In my current setup, I’m using the orifice component to define and scale the pressure drop.

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Why do I get this error from Modelica:

I’m trying to study a two-phase flow problem where, at the source, I have a quantity x of the mass flow as vapor. From what I understand, the “fixed composition value” “X” can help define this, but in my code, if I apply 0.95 (95% of my flow as fluid), I get the following error:

Does anyone have an example of a two-phase flow model with dynamic pipe?

I wrote an oms script, but I am not getting correct output described by my script. In the script I wanted to save parameters (“building_load.p”, “grid.sou.S[1]”, “generator.P”) to a csv file, so I ran this script.

I am working on a kind of plug flow reactor in which I have an unidirectional flow (let’s say, from bottom to top), but there is also mass transfer due to diffusion on the sides with the adjacent components, as in the figure below.

I’d like to parameterize the min and max attributes of a block connector.

I need a clarification about using variableFilter. I only need like 3 variables from my simulation. I want modelica to only output those variables as a csv file. I know the default is .* which outputs all the variables. I only need to select 3, so I was thinking of using variableFilter = x[.*] . I am a little confused about the syntax, but would it be variableFilter = x[.* line1.C, cableTemp.T, commercialCable.l]? Thank you for the help.

I wanted to know if TRANSFORM library is now compatible with OpenModelica ? And if yes, the degree of compatibility with OpenModelica. I’m running the test on this config: