[M3sh_Master-Ti]

In the KH model, there is an option called KH enlargement flag, by default (turning off) this option, the CONVERGE allows the drop to grow according to
Equation 11.47. It is recommended to turn it on if there exist excessively large droplets in the result. I am wondering why the droplet would grow in physics and the pros and cons of turning this on. Thank you!

[senecal]

The KH model includes the Rayleigh breakup regime, where drops can be larger than the nozzle diameter (think drops pinching off the end of a slow moving jet).

But if you aren't modeling sprays in this regime, it can lead to drops that are un-physically large. Thus, for high-speed sprays (automotive and other applications) we recommend disabling this type of breakup. Hope this helps!