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[FAQ]

SFAC is used to calculate the time increment. In semi-implicit, program calculate a time increment that is stable and to be on safer side, multiply that time increment with this safety factor to get the time increment program is going to use. For example, if the stable time increment program calculates is tstable= 1sec and SFAC is 0.9 (default), then the program uses a time increment of timinc=0.9*tstable=0.9. If the SFAC is 0.1, then the time increment used will be 0.1*tstable=0.1. If the solution seems be be unstable, using a smaller factor of safety will help.