ข้ามสารบัญไปยังเนื้อหา
อัปเดต 2026-09-07
Nodes
boundaries & junctions
Nodes are the connection points of a network. Every pipe runs between two nodes; a node is either a boundary (where the outside world sets a condition) or an interior junction.
A well-posed steady network needs at least one pressure-type boundary so the solver has a reference datum. Everything else — junctions, demands, sources — is expressed relative to that.
Pick the node type by what you physically know at that point: a known level or pressure → a boundary node; a known draw or supply → a demand/flow node; nothing known but connectivity → a plain junction.
สมการ
Continuity at every node
Flow into a node equals its demand out — enforced simultaneously at all junctions by the solver.
ข้อควรระวัง
noteA degree-1 junction carrying a demand is silently reclassified to an atmospheric open pipe on load (the demand would otherwise be discarded) — model an end-of-line draw as Assign-Flowrate to keep the flow.
noteA network with no pressure boundary is under-determined; the solver will refuse or return a loud scope note.
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