How to find the time taken for the whole simulation process in reality world?

- June 2, 2021 at 2:57 am
  
  Jason Sum
  Subscriber
  
  I know that "Total Wall-clock Time" tells the simulation time taken, but seems its about the total time for a computer to process. How can I find the physical time taken in reality, thanks!
- June 2, 2021 at 7:54 am
  
  Jason Sum
  Subscriber
  
  If I set 500 time steps and 0.005 time step size, does it means the simulation actually ran 2.5s in physical real world..?
- June 2, 2021 at 8:30 am
  
  Rob
  Forum Moderator
  
  Yes, if you're using Fluent turn on the titles (there's an icon around the graphics window) and it'll put time onto the plot.
- June 2, 2021 at 1:22 pm
  
  Jason Sum
  Subscriber
  
  Thanks! May I ask how to determine the proper Time step, Time step size and Max. Iteration? What is the purpose of Max. Iteration?
- June 3, 2021 at 11:30 am
  
  Rob
  Forum Moderator
  
  Number of time steps is self explanatory, max iteration is how many iterations per time step if convergence isn't reached. Time step size is a function of cell size and flow velocity: the flow should take 5-10 time steps to cross a cell AND you should converge a time step in around 10-15 iterations.