Yes residual is the criteria.
In the solution, till 6 seconds, it is not showing any divergence in the solution if i am using 1 sec as a time step. But after 6 seconds in the total solution time, the solution is getting diverged. So I was thinking of running the solution till 6 sec with 1 sec time step, and then run the rest of the solution as 10e-4 time step.
Is it possible?