Convergence, achieving a balanced solution

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The ultimate goal of any iterative hydraulic solver is to reach a state of convergence. But what does that actually mean in practical terms, and how does the software know when it has "solved" the network?

This section will define convergence as the point where the calculated flows and pressures satisfy the network's governing physical laws (conservation of mass and energy, and the headloss relationships) within a predefined, very small tolerance. For example, the sum of flows into and out of every node should be practically zero, and the sum of headlosses around every loop should also be practically zero.

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