Using a flow coefficient (Cv value) in SymHydraulics

Hi all,

currently I want to use SimScape / SimHydraulics to model a system. For several components I have the Cv value (flow coefficient). This is defined as Q = Cv * sqrt(dp*rho_water/rho_liquid) But I cannot find the correct block to implement it. Any suggestions?

Best regards, Luuk

[Karthick Soundarapandy]

I too face similar issue, Kindly suggest

Answer 1

[Jocie Kluger]

One approach could be to use an Orifice block with area and discharge coefficient parameters. The flow rate equation of this block simplifies to Q= Cd*Area* sqrt(2*dp/rho_liquid). You could adjust the discharge coefficient and Orifice area so Cd*Area*sqrt(2) = Cv*sqrt(rho_water). Here are links to the Orifice blocks in the Isothermal Liquid and Hydraulics libraries:

https://www.mathworks.com/help/physmod/hydro/ref/orificeil.html

https://www.mathworks.com/help/physmod/hydro/ref/fixedorifice.html

Alternatively, you could use a Flow Coefficient block in the Thermal Liquid library. Use an Interface (TL-IL) block to interface this block with the Isothermal or Hydraulic network. Don't forget to add a Thermal Liquid properties block to the Flow Coefficient block to specify non-default TL fluid properties.

https://www.mathworks.com/help/physmod/hydro/ref/flowcoefficientparameterizedvalvetl.html

https://www.mathworks.com/help/physmod/hydro/ref/interfacetlil.html

[Luuk Heijnders]

Thank you for the reply! This works.