# Compressible Solvers - Comparison

Source: https://help.sim-flow.com/solvers/compressible-solvers-comparison
Last updated: 2026-10-14

## Compressible Solvers

Compressible Solvers In this group, we have included single-phase, pressure and density-based solvers that can handle flows with significant variations in density, mostly applicable for **high-speed aerodynamics** (**Ma > 0.3**).

**Subsonic / Transonic, Steady-State, Ma < 1**

- [rhoSimpleFoam](https://help.sim-flow.com/solvers/rho-simple-foam) steady-state, pressure-based, small density changes
- [overRhoSimpleFoam](https://help.sim-flow.com/solvers/over-rho-simple-foam) extension of rhoSimpleFoam with Overset

**Subsonic / Transonic, Transient, Ma < 1**

- [rhoPimpleFoam](https://help.sim-flow.com/solvers/pimple-foam) transient, pressure-based, small density changes, DyM
- [overRhoPimpleDyMFoam](https://help.sim-flow.com/solvers/over-rho-pimple-dym-foam) extension of rhoPimpleFoam with Overset, DyM

**Transonic / Supersonic, Pressure-Based, Ma > 1**

- [sonicFoam](https://help.sim-flow.com/solvers/sonic-foam) transient, pressure-based, shock waves
- [sonicDyMFoam](https://help.sim-flow.com/solvers/sonic-dym-foam) extension of sonicFoam with DyM

**Transonic / Supersonic, Density-Based, Ma > 1**

- [rhoCentralFoam](https://help.sim-flow.com/solvers/rho-central-foam) transient, density-based, shock waves
- [rhoCentralDyMFoam](https://help.sim-flow.com/solvers/rho-central-dym-foam) extension of rhoCentralFoam with DyM

- Ma - Mach Number
- DyM - Dynamic Mesh
- Overset - also known as Chimera Grid (Method)

Additionally, these solvers support:

- Different fluid models using various equations of state, such as perfect gas or constant density
- RANS/LES turbulence models
- Porosity and MRF models (except rhoCentralFoam)
- Heat Transfer capabilities
- Passive scalar
- Custom source term (except rhoCentralFoam)