Use the Rayleigh-Taylor breakup model to account for the effect of Rayleigh–Taylor instability on the breakup of liquid droplets. Rayleigh–Taylor breakup causes the parent droplet to be completely broken up into smaller child droplets, and is usually associated with droplets undergoing large accelerations.

Specify the Rayleigh-Taylor coefficient CRT (dimensionless). The default value is 5.

If the Enable macroparticles check box is selected in the physics interface Additional Variables section, enter a value or expression for the Maximum number of particles released per breakup Nmax (dimensionless). The default is 10. This prevents an inordinate amount of child droplets from being released. If more child droplets than the maximum specified number would be released, then the multiplication factor of each particle is adjusted to compensate for the limited number of model particles.