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Before working on a project, set the simulation options for hydraulics and convergence criteria.
The Relative Flow Error determines whether the hydraulic solver has found a satisfactory solution to the equations and is the ratio between the change in the estimates of flow between the last two iterations of the algorithm, and the total aggregated flow in the network. If this error is smaller than or equal to the selected value, the simulation ends for that time step. The suggested value is 0.001 (0.1%).
The default Damping Limit is 0, which indicates that no damping should be used, and that status checks on control valves are made at every iteration. On networks that have trouble converging, a limit of 0.01 is suggested.