For any simulation, it is very convenient to let the solver automatically determine the proper time step value. To use this option we need to define time step constraints by providing the initial time step (adjusted by the solver during computations), maximal time step value and Courant number.

1. Go to *RUN* panel

2. Set the *Simulation Time [s]* to `1.5`

3. Change *Time Stepping* to *Automatic*

4. Set the parameters:

*Initial Δt [s]* `1e-06`

(solver will start computation with this value and adjust it in the next iterations)

*Max Δt [s]* `1e-03`

*Max Co [-]* `1`

*Max Alpha Co [-]* `0.5`

This calculation will require high CPU usage and might take several hours to finish the calculation depending on the machine used. If you want to shorten the computation time, you can decrease the *Simulation Time* to *0.4 s* – this is enough for purpose of further postprocessing.