Restart from a defined time-step

- December 13, 2017 at 8:32 am
  
  Luca
  Subscriber
  
  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
  
  Luca
- July 18, 2018 at 9:00 pm
  
  DrAmine
  Ansys Employee
  
  Hi,
  
  You can deal with dynamic mesh adaption to just refine based on flow solution the regions of mesh of interest. If you are working with PBS and not using a SRS method for turbulence modeling in Fluent there is no courant number limitation (implicit solver) so that a moderate value larger than 1 but still fair enough to resolve the transient effects and reduce the stiffness of matrix solution.
  
  You can restart from any backup file if you have one stored. If not then please always let Fluent make an autosave for future runs.
  
  A.

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