Hi, I was trying a learn this software, Wolfram System Modeler, by going through one of the YT videos I came across. System Modeler Fluid Dynamic System I added all the necessary data but when I tried to validate the system its displaying the below-given error. It would be nice if anyone could he…

Hi, I think you might not have specified the nPorts for boundary and tank components. The pump element is also missing a rotational source. I have attached a working version of the model in the following link for your reference: https://amoeba.wolfram.com/index.php/s/Xedxxg8HdFojYqq

Hi, Thanks for your help. I worked for me. I changed the media to ideal gas O2, its giving me this warning, Warning: The function.Modelica.Fluid.Interfaces.FluidPort_a$pipe1$port_a.Medium.T__h.Internal.solve can return without assigning the output variables x_zero. Warning: Equation system in pump…

I was able to simulate the model (I did have the warnings though). The model can be found here: https://amoeba.wolfram.com/index.php/s/cZRTNDYEJnk6smy Perhaps you didn’t assign all the Mediums to O2.

Thanks for your help. Curious to know whether we can simulate two phase flow using cryogenic liquids? I guess liquid cryogens needs to be defined from user’s end using thermodynamic properties, right?

Yes, you can simulate two-phase flows but you need to create a custom Medium with the relevant thermodynamic properties.

And how to proceed with creating a separate media with relevant thermo. properties? Like, I want to declare Liquid oxygen as a Media.

If all the thermodynamic relations are known then you can create a custom fluid using the following documentation (it will need some understanding of the Modelica language though): Modelica: Media.UsersGuide.MediumDefinition - System Modeler Documentation

Can we select fluid from CoolProp or RefProp? If yes, how to select them?

Fluid Dynamic System-System Modeler: internal error

Questions

ankitn (Ankit Naik) September 7, 2022, 11:21am 10

Check the following thread: Suggesting a fluid in SystemModeler
Status is still a work in progress.

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Fluid Dynamic System-System Modeler: internal error

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