Hi, I am trying to simulate (with fluent 15) a microfluidic device, filled with air. it is a transient simulation for understanding the pressure gradient inside the device during the injection of a solution in the inlet.  The mesh presents about 3 millions nodes. The inlet velocity is too high, so my dt has to be small to guarantee a stability of Courant number. The limit of time to simulate this device on the cluster is 10 days, and my process is aborted cause the simulation exceeds this maximum. My questions are:

Is there any way to increase the velocity of simulation (i'm just using the maximum of nodes/process in the cluster) without changing the mesh?

Is there any way to restart the simulation at the time step when the process is aborted by the cluster?

Thanks for your attention. I hope you could help me