How to calculate time step size

- July 24, 2021 at 6:13 am
  
  Arunkumarmoovandan37
  Subscriber
  
  Hi all I'm simulating a propeller with transient Analysis.
  I've to calculate thrust force using transient Analysis.
  How to use correct time step size.?
  What is the use of using transient Analysis over steady state analysis.?
- July 26, 2021 at 11:12 am
  
  Rob
  Forum Moderator
  
  Transient will show you the solution as it changes with time, steady state is the solution at equilibrium.
  Time step is based on the flow and mesh, roughly set it so the flow passes through a cell in around 10 time steps AND the solution converges in 10-15 iterations per time step. You will need many time steps to solve the problem and start getting useful data.