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Why don't pipe and orifice blocs in Simscape Fluids cause a pressure change ?

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Antoine Dugauquier
Antoine Dugauquier 2021년 5월 30일
편집: Antoine Dugauquier 2021년 5월 30일
I want to modelize a water flow going in a nozzle, especially the value of the pressure at the end of the nozzle orifice. However, no matter what the value of the pressure input or of the parameters of the blocks, the pressure differential of the several blocs are zero. My model has no pressure loss, the input and ouput pressures of the fluid are the same, which is problematic and unrealistic.
What could I do in order to change this ?
Thank you in advance.

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Yifeng Tang
Yifeng Tang 2021년 5월 30일
The model does not have an outlet right now. The system is all pressurized to the value set by the constant pressure source, but there is no flow as I don't see an outlet reservoir. Zero flow, zero pressure drop. Add a reservoir to the right of the Orifice, you should see both flow and pressure drop. Add a flow rate sensor in line with the flow to show that on a scope, or use Simscape Result Explorer or Simulink Data Inspector.
Also, consider use Isothermal Liquid domain (blue color) instead of Hydraulics (yellow). Read about the difference and advantage of using the IL domain: https://www.mathworks.com/help/physmod/simscape/ug/upgrading-hydraulic-models-to-use-isothermal-liquid-blocks.html#mw_6db868a4-020d-402e-9cc4-aed14307a38f

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