# Species & Reactions Solvers - Comparison

Source: https://help.sim-flow.com/solvers/species-and-reactions-solvers-comparison
Last updated: 2024-02-21

## Species & Reactions Solvers

Species & Reactions Solvers In this group, we have included compressible (pressure-based) solvers that can be used to simulate: **Species Transport**, **Multicomponent Gas Mixtures**, **Chemical Reactions**, **Combustion**.

**Multicomponent**

- [simpleReactingParcelFoam](https://help.sim-flow.com/solvers/simple-reacting-parcel-foam) steady-state, multiphase particle clouds
- [reactingParcelFoam](https://help.sim-flow.com/solvers/simple-reacting-parcel-foam) transient, multiphase particle clouds

**Spray**

- [sprayFoam](https://help.sim-flow.com/solvers/spray-foam) transient, liquid particles only, dedicated to fuel spray combustion
- [sprayDyMFoam](https://help.sim-flow.com/solvers/spray-dym-foam) extension of sprayFoam with DyM

**Coal**

- [simpleCoalParcelFoam](https://help.sim-flow.com/solvers/simple-coal-parcel-foam) steady-state, coal particles only
- [coalChemistryFoam](https://help.sim-flow.com/solvers/coal-chemistry-foam) transient, coal particles only

**Gas***

- [reactingFoam](https://help.sim-flow.com/solvers/reacting-foam) fluids with minor density fluctuations (caused by pressure variance), no buoyancy
- [rhoReactingFoam](https://help.sim-flow.com/solvers/rho-reacting-foam) fluids with density variations due to reactions, no buoyancy
- [rhoReactingBuoyantFoam](https://help.sim-flow.com/solvers/rho-reacting-buoyant-foam) extension of rhoReactingFoam with buoyancy forces

- * All solvers in this group are transient

- DyM - Dynamic Mesh

1. 1. Beyond the Gas subgroup, particles can be modeled along with the phase changes and reactions, taking into account the interaction between the particles and the fluid.
2. 2. Transient solvers may be used in subsonic and transonic flow regimes.
3. 3. Additionally, these solvers support:
   - RANS/LES turbulence models
   - Porosity models
   - MRF
   - Heat Transfer capabilities
   - Passive scalar
   - Custom source term