When a particle strikes a boundary face, one of several contingencies may arise:
- The particle may be reflected via an elastic or inelastic collision.
- The particle may escape through the boundary. The particle is lost from the calculation at the point where it impacts the boundary.
- The particle may be trapped at the wall. Nonvolatile material is lost from the calculation at the point of impact with the boundary; volatile material present in the particle or droplet is released to the vapor phase at this point.
- The particle may pass through an internal boundary zone, such as radiator or porous jump.
- The particle may slide along the wall, depending on particle properties and impact angle.
You also have the option of implementing a user-defined function to model the particle behavior when hitting the boundary. See the separate
UDF Manual for information about user-defined functions.
These boundary condition options are described in detail in Section
22.9.2 Particle Types in
22. Modeling Discrete Phase
22.11 Steps for Using
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