[sjtusyc]

I'm doing a transient multi-phase simulation with time-dependent pressure inlet.
I found it was difficult to converge with my desired time step. If smaller time step was used ,it'll cost time. So what should i do to get better convergence with relatively bigger time step.
1.Will the initial value influence the transient convergence as i use the steady-state result as initial value? Should i start with a better converged steady result?

2. Should i start the simulation with smaller time step and then increase the time
step as my simulation is periodic ？


Thank you in advance.