Linear eddy viscosity models
These are turbulence models in which the Reynolds stresses, as obtained from a Reynolds averaging of the Navier-Stokes equations, are modelled by a linear constitutive relationship with the mean flow straining field, such as:
where is the coefficient termed turbulence "viscosity" (also called the eddy viscosity), and is the mean strain rate defined by:
This linear relationship is also known as the Boussinesq hypothesis. For a deep discussion on this linear constitutive relationship, check section Introduction to turbulence/Reynolds averaged equations.
There are several subcategories for the linear eddy-viscosity models, depending on the number of (transport) equations solved for to compute the eddy viscosity coefficient.
- Algebraic models
- One equation models
- Two equation models
- k-epsilon models
- k-omega models
- Two equation turbulence model constraints and limiters