BDD: Figure 61: Hydraulics model constraint blocks

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The trail version of the diagram is much like the spec version except:

- The correct ValueTypes are used throughout instead of just Real.

- Each ConstraintBlock definition has been set as owned by the Block that has a usage of it (just as a modelling choice).

The resistance constraint appears to be obtained from the Hagen–Poiseuille equation:



Δp is the pressure difference between the two ends,

L is the length of pipe,

μ is the dynamic viscosity,

Q is the volumetric flow rate,

R is the pipe radius,

A is the cross section of pipe.

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