23.3.1 Injection Types

ANSYS FLUENT provides 11 types of injections:

• single

• group

• cone (only in 3D)

• solid-cone (only in 3D)

• surface

• plain-orifice atomizer

• pressure-swirl atomizer

• air-blast-atomizer

• flat-fan-atomizer

• effervescent-atomizer

• file

For each nonatomizer injection type, you will specify each of the initial conditions listed in Section  23.3, the type of particle that possesses these initial conditions, and any other relevant parameters for the particle type chosen.

You should create a single injection when you want to specify a single value for each of the initial conditions (Figure  23.3.1). Create a group injection (Figure  23.3.2) when you want to define a range for one or more of the initial conditions (e.g., a range of diameters or a range of initial positions). To define hollow spray cone injections in 3D problems, create a cone injection (Figure  23.3.3). To release particles from a surface (either a zone surface or a surface you have defined using the items in the Surface menu), you will create a surface injection. (If you create a surface injection, a particle stream will be released from each facet of the surface. You can use the Bounded and Sample Points options in the Plane Surface dialog box to create injections from a rectangular mesh of particles in 3D (see Section  28.6 for details).

Figure 23.3.1: Particle Injection Defining a Single Particle Stream

Figure 23.3.2: Particle Injection Defining an Initial Spatial Distribution of the Particle Streams

Figure 23.3.3: Particle Injection Defining an Initial Spray Distribution of the Particle Velocity

Particle initial conditions (position, velocity, diameter, temperature, and mass flow rate) can also be read from an external file if none of the injection types listed above can be used to describe your injection distribution.

The inputs for setting injections are described in detail in Section  23.3.15.