(PFA module only) When the PFA module is enabled, an additional tolerance must be specified in the Tolerance panel in the Analysis Setup window.

This is the Steady-State Pulsation Tolerance. This has a default value of 1.0E-05 which should be acceptable for the majority of pulsation studies.

"Steady-State Pulsation" means that the pulsation itself is repeating in a regular fashion. That is, the mean value, amplitude, and frequency of the pulsation are not changing over time, even though an individual property such as pressure might be rapidly changing. As the "start up" of a pulsation event is generally not of interest, this is accounted for by finding the steady state of pulsation.

The Relative Tolerance controls how tightly the Pulsation is considered "steady" - a loose tolerance may include some additional transient effects that are not desired.