Two-Phase fluid - Weird Temperature peak
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Hi people,
I am trying that really nice SimScape two-phase fluid library.
I am simulating a double acting steam free piston.
It is running without errors (most of the time, depends a lot on the valve pipe diameter I set ...), but the weird thing is when I increase the reservoir volume, the temperature suddenly shows really high peak in the beginnnig of the stroke (like if it was overheated steam).
Which is pretty surprising since I would expect a rise of pressure when the piston compress the fresh steam, not temperature ?
And the peak to be lower and lower when volume increase, but it is the contrary happening.
Any idea why is it happening ? It doesn't seems right to me.
Thank !
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/308756/image.jpeg)
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Luke Halberstadt
2020년 12월 22일
When I run the simulation, it errors out at the beginning, so I do not see the behavior you are describing.
Caused by:
- ['Test/Solver Configuration']: At time 0.001059, one or more assertions are triggered. See causes for specific information.
- Pressure at the restriction must be greater than or equal to Minimum valid pressure. The assertion comes from: Block path: Test/NPI ENGINE/INLET VALVE - AAssert location: o In between line: 167, column: 9 and line: 167, column: 15 in file: C:\Program Files\MATLAB\R2020b\toolbox\physmod\simscape\library\m\+foundation\+two_phase_fluid\+elements\variable_local_restriction.ssc
Before addressing that issue, I would first eliminate all algebraic loops as it will improve overall simulation behavior.
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