## 8.10. Particle Solver Control

The following topics are discussed in this section:

- Particle Coupling Control
- Particle Under-Relaxation Factors
- Particle Integration
- Particle Termination Control
- Particle Ignition
- Particle Source Smoothing
- Vertex Variable Smoothing
- Particle Source Control

The particle integrator is completely distinct from the normal CFD solver, so separate control parameters are required. The most important control is setting the coupling between the flow calculation and the particle integration—how frequently in terms of flow iterations the particle integration is carried out.

The `Forward Euler` method is the only integration method available. The time step is implicitly determined by the Number of Integration Steps per Element setting.

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