Community Computational Fluid Dynamics Turbo estimate of physical time step

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estimate of physical time step

sriluta

Hey, how can I estimate the physical time step of my unsteady Simulation in general ? So iam investigating 15 Stators, without a rotor ( therefore no rotation speed is set), with a very high fluctuating inflow. I started the unsteady Simulation with the initial solution of my steady state  Simulation. 

So iam using Omnis, open solver, density-based solver, the implicit time integration mode. I Started a first unsteady Simulation with the default settings ( physical time step: 0.001 s). 

One option would be with the Courant number formula,  but how do I found out  the characteristic size of  my mesh cell ? 

I read on another site that a good guideline would be 1/20th of the time it takes a fluid to pass through a component. In my case: 0.72m long channel, flow velocity: 800 m/s -->( 0.72m)/(800m/s) = 0.0009* 1/20= 0.000045s 

At the end of the day I have to do a Time Step independence study anyway.

greetings Hussein

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