Simulation Control
While a Simulation is running, you can see the Stop button in the according Simulation list entry. By hitting this button, you instruct the principia MBS engine to immediately stop the selected simulation run. All results computed so far are stored in the database and you are able to see them until the timepoint you clicked Stop.
In order to get rid of unnecessary simulation runs, you may hit Delete. This button can be triggered while a simulation is Processing too. In this case it is stopped and deleted immediately.