solving for fluid pipe inertia

I am trying to use simscape to model a fluidic system with inertia using water, and have run into issues with solving due to the 'minimum pressure' requirement not being met. I have tried isolating the problem to the simple system shown in image, with pipe and pump parameters and attached as well as the errors recieved when running. I have tired abritrarily increasing the source resevoir pressure but the same issue still occurs. It seems to work without the fluid inertia box ticked on pipe parameters, but adding that in breaks it. My guess is that there is an issue with my initial conditions, but can't work out what.

4 comentarios

Yifeng Tang
Yifeng Tang el 2 de Abr. de 2025
including the fluid inertia does require setting up the model more carefully. would you be able to attach the actual model so the community can try to identify the issue?
You may also want to describe the actual system you are trying to model, for the bigger picture.
Anthony
Anthony el 2 de Abr. de 2025
Hi, I realise there is a connection point at the end but it is literally just a resevoir at atmospheric pressure instead of that for the isolated model, sorry for the confusion. In the actual model, the flow profile from the ideal flow source is a half-rectified sine wave with an ampitidue peak of 15.7 lpm and frequency of 12.47 rad/sec.
Yifeng Tang
Yifeng Tang el 3 de Abr. de 2025
I mean the .slx file and required parameters. It's hard to diagnose based on pictures.
Jakub
Jakub el 11 de Abr. de 2025
Try to go to the Isothermal Liquid Predefined Properties (IL) block. Go to the Entrained Air tab and zero the volume fraction of the air in the liquid.

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el 1 de Abr. de 2025

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el 11 de Abr. de 2025

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