In CFX-Pre under Simulation Type for a transient simulation, how does changing the "Timestep Decrease Factor and "Timestep Increase Factor" work when adaptive timestepping is used and is based on the RMS or MAX Courant number?

The factors works as follows:

dt_new = dt_new_raw * factor + (1 - factor) * dt_old

If dt_new_raw > dt_old then the factor used is the "Timestep Increase Factor", otherwise the "Timestep Decrease Factor" is used.

dt_new_raw is based on the current and last Courant number (MAX or RMS) depending on what you have picked.

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