Simulate atomisation without using in built models
 

I would like to know if it is possible to study the effects of own nozzle design geometry on droplet size distribution, without using Fluent's atomisation model.

(i.e. import nozzle geometry mesh, set necessary BCs, and simulate the droplet distribution)

Tried it before, but the resulting fluid don't seem to break up when they exit the nozzle.

Thanks.