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[FAQ]

The total force imbalance during an unconverged sub-step is a contribution from all the nodes in the model. When the Newton-Raphson option is set to a specific non-zero number, say 2, ANSYS Mechanical stores the total imbalance coming from each node for the last 2 iterations in the form of a contour plot. The regions which contribute most of the imbalance are the problematic regions and are visually identified on the contour plots using the maximum probes. In general, it is recommended to set the Newton-Raphson option to 2 or 3 while running a nonlinear analysis so that in the event of an unconverged solution, this information may be used for debugging the convergence issues.