## RAS Models for Incompressible Flows

OpenFOAM includes the following models for incompressible, i.e. constant density, flows:

*LRR*- Launder, Reece and Rodi Reynolds-stress turbulence model for incompressible and compressible flows.
*LamBremhorstKE*- Lam and Bremhorst low-Reynolds number k-epsilon turbulence model for incompressible flows
*LaunderSharmaKE*- Launder and Sharma low-Reynolds k-epsilon turbulence model for incompressible and compressible and combusting flows including rapid distortion theory (RDT) based compression term.
*LienCubicKE*- Lien cubic non-linear low-Reynolds k-epsilon turbulence models for incompressible flows.
*LienLeschziner*- Lien and Leschziner low-Reynolds number k-epsilon turbulence model for incompressible flows.
*RNGkEpsilon*- Renormalization group k-epsilon turbulence model for incompressible and compressible flows.
*SSG*- Speziale, Sarkar and Gatski Reynolds-stress turbulence model for incompressible and compressible flows.
*ShihQuadraticKE*- Shih’s quadratic algebraic Reynolds stress k-epsilon turbulence model for incompressible flows
*SpalartAllmaras*- Spalart-Allmaras one-eqn mixing-length model for incompressible and compressible external flows.
*kEpsilon*- Standard k-epsilon turbulence model for incompressible and compressible flows including rapid distortion theory (RDT) based compression term.
*kOmega*- Standard high Reynolds-number k-omega turbulence model for incompressible and compressible flows.
*kOmegaSSTSAS*- Scale-adaptive URAS model based on the k-omega-SST RAS model.
*kkLOmega*- Low Reynolds-number k-kl-omega turbulence model for incompressible flows.
*qZeta*- Gibson and Dafa’Alla’s q-zeta two-equation low-Re turbulence model for incompressible flows
*realizableKE*- Realizable k-epsilon turbulence model for incompressible and compressible flows.
*v2f*- Lien and Kalitzin’s v2-f turbulence model for incompressible and compressible flows, with a limit imposed on the turbulent viscosity given by Davidson et al.

## RAS Models for Compressible Flows

OpenFOAM includes the following models for compressible, i.e. variable density, flows:

*LRR*- Launder, Reece and Rodi Reynolds-stress turbulence model for incompressible and compressible flows.
*LaunderSharmaKE*- Launder and Sharma low-Reynolds k-epsilon turbulence model for incompressible and compressible and combusting flows including rapid distortion theory (RDT) based compression term.
*RNGkEpsilon*- Renormalization group k-epsilon turbulence model for incompressible and compressible flows.
*SSG*- Speziale, Sarkar and Gatski Reynolds-stress turbulence model for incompressible and compressible flows.
*SpalartAllmaras*- Spalart-Allmaras one-eqn mixing-length model for incompressible and compressible external flows.
*buoyantKEpsilon*- Additional buoyancy generation/dissipation term applied to the k and epsilon equations of the standard k-epsilon model.
*kEpsilon*- Standard k-epsilon turbulence model for incompressible and compressible flows including rapid distortion theory (RDT) based compression term.
*kOmega*- Standard high Reynolds-number k-omega turbulence model for incompressible and compressible flows.
*kOmegaSSTSAS*- Scale-adaptive URAS model based on the k-omega-SST RAS model.
*realizableKE*- Realizable k-epsilon turbulence model for incompressible and compressible flows.
*v2f*- Lien and Kalitzin’s v2-f turbulence model for incompressible and compressible flows, with a limit imposed on the turbulent viscosity given by Davidson et al.

## RAS Models for Compressible Multiphase Flows

OpenFOAM includes the following models for compressible multiphase flows, e.g. bubbly flows:

*LaheyKEpsilon*- Continuous-phase k-epsilon model including bubble-generated turbulence.
*continuousGasKEpsilon*- k-epsilon model for the gas-phase in a two-phase system supporting phase-inversion.
*kOmegaSSTSato*- Implementation of the k-omega-SST turbulence model for dispersed bubbly flows with Sato (1981) bubble induced turbulent viscosity model.
*mixtureKEpsilon*- Mixture k-epsilon turbulence model for two-phase gas-liquid systems.