The Discontinuities pane tool

We have seen how state contributions allow you to easily locate the area where modelling problems have occurred on the sketch. We will now see how this could also have been done with the Discontinuities pane.

Start again from the original demo example, and look specifically at around t = 3.5 s:

Figure 87: Determination of the time zone of interest for performance analysis

In the Discontinuities pane, you can see that only two submodels are responsible for the main discontinuities in the system: the pump and the actuator.

Figure 88: Share of discontinuities between submodels

Switch to the Curves tab to get a better view on the temporal distribution of the events generated by these two submodels:

Figure 89: The actuator generates lot of discontinuities in the time zone of interest

The instantaneous contribution of the actuator submodel takes place in the time zone where the simulator globally started to slow down. About 1900 discontinuities are generated by the actuator in about 120 ms. This explains the shape of the current integration time step in this timeframe, the solver being restarted after each of these events.

We will now consider the proposed parametrization for the actuator damping coefficient again. We will apply it to the current system and restart the integration.

Figure 90: Share of discontinuities after model re-parametrization

The proportion of discontinuities generated by the actuator is now almost negligible and the integration performance is good.