Ansys Fluent offers the following droplet breakup models:
Taylor Analogy Breakup (TAB) model
The TAB model is recommended for low-Weber-number injections and is well suited for low-speed sprays into a standard atmosphere.
Wave model
The Wave model is more applicable for Weber numbers greater than 100.
KHRT model
The KHRT offers a transition between the above application areas. It considers the competing effects of aerodynamic breakup and instabilities due to droplet acceleration. It is combined with the Levich model for the liquid core length.
Stochastic Secondary Droplet (SSD) model
The SSD model treats breakup at high Weber numbers as a discrete random event resulting in a distribution of diameter scales over a range.
Madabhushi breakup model
The Madabhushi breakup model is suitable for numerical simulations of liquid jets in subsonic crossflow.
Schmehl breakup model
The Schmehl breakup model uses an advanced modeling of secondary breakup of droplets including bag, multimode, and shear mechanisms for improved physical description of the spray.
The Wave and KHRT models are popular for use in high-speed fuel-injection applications. The choice of model depends on the relative importance of momentum and surface tension in the droplet breakup; this is described by the Weber number, which is defined in Equation 12–406.
Details for each model are provided in the following sections: