# Convergence Tolerances have been relaxed

This message appears simply to make the user aware that the default convergence tolerance settings have been automatically relaxed by the software in order to converge the model. However, the criteria will only be relaxed in FluidFlow to levels of, for example, 0.01% or 0.1% in order to converge. FluidFlow then enunciates a warning to make the user aware of this condition. As flow calculation accuracy is required to approx. +/- 5%, the calculated results will therefore still be accurate. It is however recommended that the engineer reviews the model messages to determine if there is a more effective and efficient design solution. If the network doesn't converge with this level of accuracy, then FluidFlow enunciates a warning indicating "the network has not converged". The default convergence tolerance criteria can be viewed by selecting: Options | Calculation | Convergence Criteria. Users can adjust the calculation convergence criteria from this dialog however, unless you have a valid reason for doing so, it is not recommended that you adjust these settings. At the limit of convergence, the solver can exit before full convergence has occurred, this results in inaccurate answers. If this condition arises, you can always talk to our support team (support@fluidflowinfo.com) if you have a network that is difficult to converge.