Applies To Product(s): Bentley HAMMER Version(s): 08.11.XX.XX Environment: N\A Area: Modeling Subarea: N\A Original Author: Jesse Dringoli, Bentley Technical Support Group Problem When computing a model with "Unsteady" selected as the transient friction method, unexpected surges or instability occur in the transient results, or the following errors may appear in the user notification window: "Invalid results reached. Please check the input data for the connected elements." Solution In some cases, the unsteady friction method can be very sensitive to the calculation timestep and model configuration. First, consider using a different transient friction method. The "steady" method is more stable and is generally considered more conservative. If you must use the unsteady method, it is highly recommended that you use the "Unsteady - Vitkovsky" method, which is the superior option for unsteady analyses. You can also try adjusting your calculation timestep. Go to Analysis > Transient Timestep options. Check "Use Custom Time Step" and try a larger or smaller timestep. Possible values may lie between 0.001 and 0.1 seconds.
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