Mass Transfer: Advanced CFD Training Package — Ep 05
Droplets: Multicomponent Particle Type
- Lesson
- 05
- Run Time
- 28m 40s
- Published
- Sep 21, 2026
- Category
- Mass Transfer
- Course Progress
- 0%
Multicomponent Particle Type for Droplets, CFD Simulation ANSYS Fluent Training
Description
This project investigates the multicomponent particle type for droplet modeling using ANSYS Fluent, employing a one-way DPM approach to simulate the discrete phase.
The 3D geometry was built in SpaceClaim, with a computational domain 100 mm long and 20 mm in both height and width. The domain was meshed in ANSYS Meshing using an unstructured grid totaling 56,245 cells.
Methodology
Several assumptions were applied to the simulation: a pressure-based solver was used, the simulation was run as unsteady, and gravitational effects were excluded.
Key simulation settings included:
Viscous model: k-omega SST
Discrete phase: Enabled with unsteady particle tracking; injected material defined as a hydrogen peroxide-water mixture, using the multicomponent particle type with a cone injection configuration
Boundary conditions: Velocity inlet (drying air) at 0.2 m/s and 450 K, with discrete phase set to escape; pressure outlet at 0 Pa gauge pressure with discrete phase set to escape; stationary walls with discrete phase set to reflect
Solution methods: SIMPLE pressure-velocity coupling, second-order discretization for pressure, second-order upwind for momentum, and first-order upwind for the modified turbulent viscosity
Initialization: Hybrid method
The injected droplets consist of two mixed species — water and hydrogen peroxide — modeled using the multicomponent particle type, which allows each species within a single droplet to behave independently: water is defined as evaporating, while the second species is treated as non-evaporating.
Conclusion
The results clearly show water evaporating from within the droplets, accompanied by a corresponding decrease in droplet diameter over time — confirming that the multicomponent particle model successfully captures the differential evaporation behavior between the two species present in each droplet, with only the water fraction evaporating while the hydrogen peroxide fraction remains, consistent with how the two components were defined.