Contraction/Expansion
Use the Contraction/Expansion node to introduce additional pressure losses due to irreversible turbulent friction in a point associated with the position of a contraction or expansion in the pipe system.
The Contraction/Expansion node can only be applied to points that are connected to exactly two pipe segments.
Contraction Specification
Select an option from the Friction list — Sudden (the default), Gradual, or User-defined loss coefficient.
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For Gradual, enter an Angle of convergence α (SI unit: radians). The default is 0 radians.
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For User-defined loss coefficient, enter a Loss coefficient Kf (dimensionless). The default is 0.