Simulink / Simscape Corrugated Pipe

Hi,

I am modelling a 1 dimensional two-phase fluid network with both smooth pipes and corrugated hose. The smooth pipes were straightforward as there was already a Pipe (2P) block I could use. For the corrugated hose, my understanding is that the head loss is proportional to velocity to the power of 2.31 in Neill's correlation, and also that friction factor is significantly larger compared to smooth tubes [see https://ntrs.nasa.gov/api/citations/19660024205/downloads/19660024205.pdf ], which is the reason I cannot use a Pipe (2P) block as it uses velocity squared for head loss and uses other correlations for friction factor. What would be the best way to model a corrugated hose accurately using simscape?

Thanks

Answer 1

[Kothuri]

Hi Ege Karaahmet,

To accurately model a corrugated hose in a 1 dimensional two-phase fluid network, you can follow the below steps:

• You can create a "Custom Block" for the corrugated hose using the Simscape Language to implement Neill's correlation and can base it on the "Pipe(2D)" block and modify the head loss equations.
• Use the Simscape "Two-Phase Fluid Domain" as a starting point for building the "Custom Block".
• Compare simulation results from the custom block with experimental or reference data for the specific corrugated hose to validate if the custom block is working as expected.
• Use the custom "CorrugatedHose" block in your existing Simscape Two-Phase Fluid Network by placing it between the appropriate nodes.
• Ensure proper parameterization (such as length, diameter, and correlation coefficients) based on the corrugated hose specifications.

You can refer the below documentation links for more info on:

• Two-Phase Fluid Domain - https://www.mathworks.com/help/releases/R2023b/simscape/lang/two-phase-fluid-domain.html
• Creation of Custom Block in Simscape - https://www.mathworks.com/help/releases/R2023b/simscape/customization.html